@Proceedings{CitationKey,
title = {{Network Neutrality and Open Access}},
year = {2011},
editor = {Spiecker gen. D\"{o}hmann, Indra and Kr\"{a}mer, Jan},
address = {Baden Baden},
publisher = {Nomos Publishing},
note = {ISBN 978-3-8329-6618-8, 214 p},
url = {http://www.amazon.de/dp/3832966188},
abstract = {The principle of Network Neutrality prescribes that all data packets
that are being sent through the Internet must be treated equally with respect
to their origin, destination and content. It has recently achieved much attention
by policymakers in the US and Europe and is debated very controversially. This
book seeks to advance this debate by providing a scientific and unbiased view
on Network Neutrality, and the related issue of Open Access as policy instruments
to counteract the anticipated scarcity of telecommunications infrastructure.
The book comprises articles by leading international legal and economic scholars
as well as by policymakers on the possible effects of Network Neutrality and
Open Access regulation and thus offers a holistic and interdisciplinary viewpoint
on these issues.}}

					

@Proceedings{CitationKey,
title = {{Information Management and Market Engineering: Vol. II}},
year = {2010},
editor = {Dreier, Thomas and Kr\"{a}mer, Jan and Studer, Rudi and Weinhardt,
Christof},
number = {11},
series = {Studies on eOrganisation and Market Engineering},
address = {Karlsruhe},
publisher = {KIT Scientific Publishing},
note = {260 p., ISBN: 978-3-86644-589-5},
url = {http://www.amazon.de/dp/386644589X},
abstract = {The research program "Information Management and Market Engineering"
focuses on the analysis and the design of electronic markets. Taking a holistic
view of the conceptualization and realization of solutions, the research
integrates the disciplines business administration, economics, computer science,
and law. Topics of interest range from the implementation, quality assurance,
and further development of electronic markets to their integration into business
processes, innovative business models, and legal frameworks.



This second volume not only collects the advancements of the Graduate School
"Information Management and Market Engineering" at the Karlsruhe Institute of
Technology, which is funded by the Deutsche Forschungsgemeinschaft (German
Research Foundation), since the first volume of this book, but also points at
new research fields that have recently been explored.}}

					

@Proceedings{CitationKey,
title = {{Communications Regulation in the Age of Digital Convergence: Legal
and Economic Perspectives}},
year = {2009},
editor = {Kr\"{a}mer, Jan and Seifert, Stefan},
address = {Karlsruhe},
publisher = {Universit\"{a}tsverlag Karlsruhe},
note = {110 p., ISBN 978-3-86644-387-7},
url = {http://www.amazon.de/dp/3866443870},
abstract = {The communications sector is currently undergoing a tremendous
transformation. In particular, the changes driven by the digitalization and
convergence of communications networks and devices have a significant impact
on society and culture as well as economic growth and wealth. The editors of
this book have brought together a distinguished panel of regulators as well
as lawyers and economists from both academia and industry to present their
insights on the convergence phenomenon. The contributions cover a great deal
of the relevant topics in communications regulation, such as technological and
network neutrality, distribution of the digital dividend, and incentives for
investment and innovation. They highlight the fact that the technological
advancements have caused major changes in the regulatory frameworks of Europe
and the US and continue to pose regulatory challenges with respect to ensuring
a level playing field for all competitors. However, until today also many
regulatory legacies of the analog age have remained unchanged and need
reconsideration in the age of digital convergence.}}

					

@Book{CitationKey,
title = {{Bundling Telecommunications Services: Competitive Strategies for
Converging Markets}},
publisher = {Universit\"{a}tsverlag Karlsruhe},
year = {2009},
author = {Kr\"{a}mer, Jan},
address = {Karlsruhe},
note = {174 p., ISBN 978-3-86644-377-8},
url = {http://www.amazon.de/dp/3866443773},
abstract = {With the advent of digital convergence, incumbent telephone and
cable companies have begun to offer their services, such as voice telephony,
Internet and TV in so-called triple play packages. While carefully recognizing
the technological, legal and economic framework of the fixed-line
telecommunications industry, this book investigates whether bundling is indeed
a profitable pricing strategy for the firms and if it can possibly facilitate
the leverage of market power into neighboring markets. In contrast to previous
work on bundling, a symmetric duopoly market structure is considered, with two
firms having market power in their respective home markets, but without any
clear ex-ante advantage for either firm on the converged market.

This book also serves as a basic introduction into the technological, economic
and regulatory concepts of communications as well as into the theory of
bundling.}}

					

@Book{CitationKey,
title = {{The Conference Scheduling Problem}},
publisher = {VDM Verlag},
year = {2009},
author = {Kr\"{a}mer, Jan},
address = {Saarbr\"{u}cken},
note = {160 p., ISBN 978-3-639-15876-2},
url = {http://www.amazon.de/dp/3639158768},
abstract = {This book studies exact solution procedures for the so-called
Conference Scheduling Problem (CSP), which seeks to minimize the duration of
a conference, where some of the activities cannot be held concurrently. The
CSP corresponds to non-preemptive scheduling of independent activities with
dedicated resources and constitutes a special case within the more general
Resource Constraint Project Scheduling Problem (RCPSP) as well as the machine
scheduling framework, and as such it is NP-hard. The core characteristics of
CSP are commonly encountered in problems of different domains and therefore
the problem is of high practical relevance. The book focuses on the analysis
and comparison of graph-based solution procedures, which operate on a constrained
graph that is derived from the confliciting acitivies to be scheduled. In
particular Interval Coloring and Comparability Graph Augmentation are considered.
An emphasis is put on the investigation of variations of the latter procedure,
which exploits the structure of the constraint graph and is therefore robust
to variations in the activity durations.}}

					

@Article{CitationKey,
author = {Kr\"{a}mer, Jan and Wiewiorra, Lukas},
title = {{Network Neutrality and Congestion Sensitive Content Providers:
Implications for Content Variety, Broadband Investment and Regulation}},
journal = {Information Systems Research},
year = {2012},
abstract = {We study departures from network neutrality through implementing
a Quality of Service tiering regime in which an ISP charges for prioritization
on a non-discriminatory basis. We find that Quality of Service tiering may be
more efficient in the short run, because it better allocates the existing network
capacity, and in the long run, because it provides higher investment incentives
due to the increased demand for priority services by the entry of new congestion
sensitive content providers. Which network regime is the most efficient depends
on the distribution of congestion sensitivity among content providers, but a
guideline is that the regime that provides higher incentives for infrastructure
investments is more efficient in the long run.}}

					

@Article{CitationKey,
author = {Kr\"{a}mer, Jan and Wiewiorra, Lukas},
title = {{Beyond the flat rate bias: The flexibility effect in tariff choice}},
journal = {Telecommunications Policy},
year = {2012},
volume = {36},
pages = {29-39},
number = {1},
doi = {10.1016/j.telpol.2011.11.015},
url = {http://www.sciencedirect.com/science/article/pii/S0308596111002084},
abstract = {Flat rates are a prominent pricing scheme for telecommunications
services and are often preferred by consumers although average costs would be
lower in an alternative usage-based tariff. Reasons are that flat rates protect
against unexpectedly high costs (insurance effect), are more likely to be chosen
if actual usage is overestimated (overestimation effect), and prevent any
disutility that is associated with the immediate perception of usage marginal
costs  (taximeter effect). This study complements the literature on tariff biases
by highlighting that a lack of tariff flexibility is a major impediment to
choosing a flat rate: Empirical support for this flexibility effect is found,
while, at the same time, the insurance and overestimation effect that run in
favor of flat rates are confirmed. Finally, the managerial implications of the
findings for the introduction of the new cost cap tariff are discussed. The
hybrid cost cap tariff can combine the flexibility and the insurance property,
and may, therefore, exert a cost cap bias on consumers.}}

					

@Article{CitationKey,
author = {Adam, Marc T. P. and Kr\"{a}mer, Jan and J\"{a}hnig, Caroline and
Seifert, Stefan and Weinhardt, Christof},
title = {{Understanding Auction Fever: A Framework for Emotional Bidding}},
journal = {Electronic Markets},
year = {2011},
volume = {21},
pages = {197-207},
number = {3},
doi = {http://dx.doi.org/10.1007/s12525-011-0068-9},
url = {http://www.springerlink.com/content/e0451724342632lq}}

					

@Article{CitationKey,
author = {Kr\"{a}mer, Jan},
title = {{Bundling Vertically Differentiated Communications Services to Leverage
Market Power}},
journal = {info: The journal for policy, regulation and strategy for
telecommunications, Information and Media},
year = {2009},
volume = {11},
pages = {64-74},
number = {3},
month = {May},
doi = {10.1108/14636690910954980},
url = {http://www.emeraldinsight.com/10.1108/14636690910954980},
abstract = {Purpose – Despite Digital Convergence, in many countries the former
telco monopolist remains to hold significant market power in its home market
for telecommunication services. I investigate whether and how bundling services
may achieve leverage of market power from the telco's home to a secondary service
market (e.g. video broadcasting).



Design/methodology/approach – To this extend I consider a formal game-theoretic
model where the telco firm holds a monopoly in the market for telecommunications
services, while competing with a cable firm in the market for video broadcasting
services. Services may differ in quality. For the firms, the provision of
high-quality services is more costly than the provision of low-quality services.
Conversely, consumers have a greater reservation price for higher service
qualities. Therefore firms face a trade off between revenues and cost when
selecting the optimal service quality.



Findings – The model shows that the telco firm can achieve market power leverage
by bundling its services, which therefore is more profitable than offering each
service separately. In particular, the quality leverage mechanism is highlighted,
which reveals that bundling alters the optimal service quality choice of the
competitors favorably.



Research limitations/implications – Like every game-theoretic model, the present
model rests on formal assumptions representing stylized facts. Future research
should try back these by empirical evidence. 



Practical implications – The paper reveals how bundling may be employed as a
strategic weapon in order to increase profits in the converging communications
market.



Originality/value – The paper shows that bundling communications services can
not only have significant ramifications for the quality of these services, but
also for the competition in industry.



Keywords: Telecommunications Industry, Digital Communications Systems, Competitive
Strategy, Pricing, Services, Game-Theory}}

					

@Inproceedings{CitationKey,
author = {Adam, Marc T. P. and Gamer, Matthias and Kr\"{a}mer, Jan and Weinhardt,
Christof},
title = {{Measuring Emotions in Electronic Markets}},
booktitle = {Proceedings of the International Conference on Information Systems
(ICIS)},
year = {2011},
address = {Shanghai, China},
pages = {1-19},
url = {http://aisel.aisnet.org/icis2011/proceedings/breakthroughideas/1}}

					

@Incollection{CitationKey,
author = {Adam, M. T. P.; Kr\"{a}mer, Jan; Weinhardt, Christof; Ehrhart,
Karl-Martin},
title = {{Investigating Auction Fever}},
booktitle = {Information Management and Market Engineering: Vol. II},
publisher = {KIT Scientific Publishing},
year = {2010},
editor = {Dreier, Thomas and Kr\"{a}mer, Jan and Studer, Rudi and Weinhardt,
Christof},
series = {Studies on eOrganisation and Market Engineering},
pages = {141-157},
address = {Karlsruhe},
note = {ISBN: 978-3-86644-589-5}}

					

@Inproceedings{CitationKey,
author = {Seifert, Stefan and Kr\"{a}mer, Jan and Mazarakis, Athanasios},
title = {{Anreize zur Nutzung von Wikis in der Hochschullehre - Ergebnisse eines
Pilotprojekts}},
booktitle = {Mensch & Computer 2010},
year = {2010},
address = {Duisburg, Germany},
pages = {179–188},
editor = {Ziegler, J\"{u}rgen and Schmidt, Albrecht},
publisher = {Oldenbourg Wissenschaftsverlag, M\"{u}nchen},
note = {ISBN 978-3-486-70408-2},
abstract = {In einer Pilotstudie an der Universit\"{a}t Karlsruhe wurden
Wiki-Systeme in die Hochschullehre integriert, mit dem Ziel die Studierenden
schon w\"{a}hrend des Semesters zu einer aktiven Auseinandersetzung mit dem
Lehrstoff zu animieren. In dieser Arbeit werden die wesentlichen Erkenntnisse
der Studie vorgestellt, insbesondere im Hinblick auf die Auswirkungen
verschiedener Nutzungsanreize auf die studentische Beteiligung in
vorlesungsbegleitenden Wikis. In der Pilotstudie mit drei unterschiedlichen
Lehrveranstaltungen lassen sich beachtliche Unterschiede hinsichtlich des
studentischen

Engagements aufgrund unterschiedlicher Anreizstrukturen beobachten. Es wird
ebenso diskutiert inwieweit sich die Erkenntnisse der Studie auf andere
Lehrveranstaltungen \"{u}bertragen lassen und welche Potenziale f\"{u}r die
Hochschullehre damit verbunden sind.}}

					

@Inproceedings{CitationKey,
author = {Mazarakis, Athanasios and Kr\"{a}mer, Jan},
title = {{Feedbackmechanismen zur Steigerung der Beteiligung im Web 2.0 –
Ergebnisse einer Feldstudie zu Vorlesungswikis}},
booktitle = {Interaktive Kulturen - Workshop-Band},
year = {2010},
address = {Duisburg, Germany},
pages = {187-192},
editor = {Schroeder, Ulrik},
series = {Proceedings der Workshops der DeLFI 2010 - Die 8. E-Learning Fachtagung
Informatik der Gesellschaft f\"{u}r Informatik e. V.},
month = {September},
publisher = {Logos Verlag Berlin},
note = {ISBN 978-3-8325-2578-1

Duisburg, 12.-15. September 2010},
abstract = {Wir untersuchen den Einfluss sogenannter Feedbackmechanismen auf
die Beteiligung im Web 2.0 Kontext. In einer explorativen Studie wurden zwanzig
Studierende bei der Registrierung f\"{u}r ein Vorlesungswiki zuf\"{a}llig,
entweder der Experimentalbedingung (Feedback nach jedem Beitrag) oder der
Kontrollbedin-gung (ohne Feedback) zugewiesen. Zus\"{a}tzlich wurden die
Pers\"{o}nlichkeitseigen-schaften des NEO-FFI Fragebogens abgefragt, wie auch
die psychologischen Grundbed\"{u}rfnisse Autonomie, Kompetenz und soziale
Eingebundenheit. Die Er-gebnisse zeigen einen Anstieg der Beteiligung am Wiki
in der Experimentalbedin-gung (mit Feedback).}}

					

@Inproceedings{CitationKey,
author = {Kr\"{a}mer, Jan; Wiewiorra, Lukas},
title = {{Consumer Perception of Mobile Telephony Tariffs with Cost Caps}},
booktitle = {Proceedings of 9th Conference on Telecommunications, Internet and
Media Techno Economics (CTTE)},
year = {2010},
address = {Ghent, Belgium},
pages = {1-8},
month = {7-9 June 2010},
publisher = {IEEE Xplore},
note = {ISBN: 978-1-4244-7988-7},
doi = {http://dx.doi.org/10.1109/CTTE.2010.5557703},
abstract = {In this article we provide a seminal academic investigation of mobile
telephony consumers' perception of the recently introduced cost cap tariff in
comparison to corresponding pay-per-use and flatrate calling plans. Previous
studies have identified several psychological effects through which consumers
are believed to be biased towards flatrate plans. However, flatrate plans also
limit customers' tariff flexibility in months of low usage. Cost cap tariffs
are a hybrid between pay-per-use and flatrate plans and can offer cost insurance
while maintaining flexibility. In particular, we provide evidence from a survey
among 214 German university students that flexibility, cost insurance and the
so-called taximeter effect are the main drivers behind cost cap tariff choice.
Furthermore, we show that the insurance and taximeter effects are distinct if
evaluated within a flatrate or cost cap tariff framework. Finally, based on
our results we also comment on the profitability of cost cap plans from a
strategic management perspective.}}

					

@Inproceedings{CitationKey,
author = {Elsner, Helmuth and Kr\"{a}mer, Jan},
title = {{Einsatz von Recommender Systemen zum Management von
Unternehmensportalen}},
booktitle = {Multikonferenz Wirtschafsinformatik 2010},
year = {2010},
pages = {1819-1830},
editor = {Schumann, Matthias and Kolbe, Lutz and Breitner, Michael and Friedrichs,
Arne},
month = {23. - 25.02.2010},
publisher = {Universit\"{a}tsverlag G\"{o}ttingen},
note = {ISBN 978-3-941875-31-9},
url = {http://webdoc.sub.gwdg.de/univerlag/2010/mkwi},
abstract = {Unternehmensportale stellen eine weltweit zug\"{a}ngliche Plattform
zur Unterneh-menskommunikation bereit. Portale der vierten Generation bieten
heute nicht nur Wissensmanagement- und Kollaborationsfunktionalit\"{a}ten an
(Terra und Gorden, S. 1-419; Benbya et al. 2004, S. 201-22), sondern k\"{o}nnen
durch intelligente Dienste auch komplexe Gesch\"{a}ftsprozesse unterst\"{u}tzen
und koordinieren (Dias 2001, S. 274-279; Murray 1999). White spricht in diesem
Zusammenhang von einer Entwicklung hin zu „Enterprise Application Suites“ (2003,
S. 2). Die M\"{o}glichkeiten, die ein Portal in Bezug auf die Unterst\"{u}tzung
verschiedenster Unternehmensprozesse bieten kann, sind also sehr vielf\"{a}ltig
und f\"{u}hren in der Folge zu einem stetigen Wachstum des Portals in Bezug
auf die Komplexit\"{a}t und Anzahl der Dienste, sowie der Nutzer. Das Management
des Portalwachstums und seiner Folgen stellt daher eine zentrale Herausforderung
beim Einsatz von Unternehmensportalen der vierten Generation dar. Explizite
L\"{o}sungsans\"{a}tze zur Bew\"{a}ltigung dieser Problematik finden sich bisher
nicht in der Literatur, die lediglich die M\"{o}glichkeiten des Portalkonzepts
in Unternehmen hervorhebt. Im Gegensatz zu Internetportalen verfolgen
Unternehmensportale kein eigenes Gesch\"{a}ftsmodell, sondern unterst\"{u}tzten
Unternehmen in der Verfolgung ihres Gesch\"{a}ftsmodells. Dieser fundamentale
Unterschied f\"{u}hrt auch zu anderen Anforderungen an das jeweilige
Portalmanagement. Die zentrale Herausforderung des Portalmanagements liegt darin,
Mitarbeiter effektiv bei der Nutzung des Portals zu unterst\"{u}tzen, wobei
das stetige Wachstum besonders ber\"{u}cksichtigt werden muss. Einerseits sollen
Mitarbeiter auf die ihnen bekannten Dienste weiter zugreifen k\"{o}nnen.
Andererseits kann das Potenzial des Portals aber nur entfaltet werden wenn andere
relevante Dienste auch wahrge-nommen werden und zu deren Nutzung angeregt wird.

Um dieses Ziel zu erreichen wird der Einsatz eines Recommender-Systems, welches
spezielle auf den Einsatz in Unternehmensportalen zugeschnitten ist, 
vorgeschlagen. Wichtige Voraussetzungen f\"{u}r die Wahl eines geeigneten
Recommender-Ansatzes sind insbesondere, dass es impraktikabel oder
uner-w\"{u}nscht ist (i) alle Dienste des Portals vollst\"{a}ndig semantisch
zu beschreiben, (ii) das Nutzungsverhalten und Arbeitsprofil jedes Nutzers
vollst\"{a}ndig zu erfassen. Daher k\"{o}nnen nur solche Recommender angewendet
werden, die das Nutzungsverhalten der Mitarbeiter analysieren und daraus
Empfehlungen ableiten. Diese Eigenschaften bef\"{u}rworten die Wahl des
Collaborative Filtering Ansatzes (Goldberg 1992; Resnick et al. 1994)
gegen\"{u}ber dem des Content-Based Filtering (Adomavicius und Tuzhilin 2005).
Bei den Collaborative Filtering Algorithmen sind wieder die memory-based
Algorithmen gegen\"{u}ber den memory-based Algorithmen vorzuziehen, da letztere
nur auf Grund ihrer Skalierbarkeit Vorteile bringen (Breese et al. 1998; Herlocker
et al. 2004). Diese spielt jedoch bei Unternehmensportalen auf Grund der
verh\"{a}ltnism\"{a}\ssig geringen Zahl von Nutzern und Objekten eine
untergeordnete Rolle. Im Weiteren wird auch diskutiert, welche weiteren
Designentscheidungen des Recommender-Systems im konkreten Unternehmenskontext
getroffen werden m\"{u}ssen und wie diese evaluiert werden k\"{o}nnen. Hierzu
geh\"{o}rt unter anderem die Wahl der geeigneten Methodik zur Berechnung der
\"{A}hnlichkeit zwischen Nutzern, das Verfahren zur impliziten Berechnung der
Ratings f\"{u}r Dienste und die Art der Anzeige der Empfehlungen.}}

					

@Inproceedings{CitationKey,
author = {Blau, Benjamin and Kr\"{a}mer, Jan and Conte, Tobias and van Dinther,
Clemens},
title = {{Service Value Networks}},
booktitle = {Proceedings of the 11th IEEE Conference on Commerce and Enterprise
Computing},
year = {2009},
address = {Vienna, Austria},
pages = {194-201},
month = {July},
doi = {10.1109/CEC.2009.64},
abstract = {The current industry-driven trend in providing flexible software
services lays the ground for the new research area "service value networks"
(SVNs). We observe a rising number of industry-oriented publications provided
by research departments of large companies such as IBM or SAP as well as the
fact that more and more IS conferences offer special tracks on that issue.
However, when it comes to formalizing and economically analyzing such SVNs that
offer joint complex services to service customers, scientific approaches are
in their infancy. We intend to fill this research gap by providing a clear
understanding of service value networks by defining their characteristics, their
structure, and their components.

Mapping these aspects into a formalized model, we intend to establish a reference
point for future work in the area of service value networks.}}

					

@Inproceedings{CitationKey,
author = {Kr\"{a}mer, Jan},
title = {{Digital Convergence, Pricing Strategies and Firms' Profits in the
Telecommunication and Entertainment Media Industry}},
booktitle = {Proceedings of the 6th Conference on Telecommunication
Techno-Economics},
year = {2007},
address = {Helsinki, Finland},
pages = {1-8},
month = {June},
publisher = {IEEE Xplore},
note = {ISBN 978-1-4244-1233-4},
doi = {http://dx.doi.org/10.1109/CTTE.2007.4389896},
abstract = {Digital convergence of telecommunication and entertainment media
services drove former network monopolists into a prisoner's dilemma forcing
them to enter each others markets. In this reciprocal duopoly firms now offer
their services in a bundle, commonly known as triple play. I investigate whether
bundling is indeed a profitable pricing strategy for these services and if it
can facilitate market power leverage. I will show that bundle pricing serves
as a powerful leverage device for one firm in this industry. This is achieved
through a quality sorting effect accruing as the firms wish to shield themselves
from increased price competition in the market for bundles. Thereby, one firm
emerges as the high-quality, high-profit provider in both markets, whereas the
competing firm has to settle for low qualities and profits.}}

					

@Incollection{CitationKey,
author = {Kr\"{a}mer, Jan and Berninghaus, Siegfried and Weinhardt, Christof},
title = {{Competing on Many Fronts: Entry Networks in an Economy of Multi-Product
Firms}},
booktitle = {Information Management and Market Engineering},
publisher = {Universit\"{a}tsverlag Karlsruhe},
year = {2006},
editor = {Dreier, Thomas and Studer, Rudi and Weinhardt, Christof},
pages = {139-151},
url =
{http://www.amazon.de/Information-Management-Market-Engineering-Thomas/dp/3866440596/}}

					

@Conference{CitationKey,
author = {Astor, Philipp and Adam, Marc T. P. and Kr\"{a}mer, Jan},
title = {{Einfluss emotionaler Bilder auf das Bietverhalten}},
booktitle = {Tagung der Gesellschaft f\"{u}r experimentelle Wirtschaftsforschung},
year = {2011},
address = {N\"{u}rnberg, Germany}}

					

@Conference{CitationKey,
author = {Adam, Marc T. P. and Kr\"{a}mer, Jan and Weinhardt, Christof},
title = {{Excitement and Time Pressure in Dutch Auctions}},
booktitle = {International Economic Association 16th World Congress},
year = {2011},
address = {Tsinghua University, Beijing, China}}

					

@Conference{CitationKey,
author = {Astor, Philipp J. and Adam, Marc T. P. and Kr\"{a}mer, Jan},
title = {{Emotion Induction in Auctions}},
booktitle = {Economic Science Association},
year = {2011},
address = {Chicago, IL, USA}}

					

@Conference{CitationKey,
author = {Adam, Marc T. P.; Caspary, C.; Kr\"{a}mer, J.},
title = {{Emotionen und Zeitdruck in der Japanischen Auktion}},
booktitle = {Tagung der Gesellschaft f\"{u}r experimentelle Wirtschaftsforschung},
year = {2010},
address = {Luxembourg, Luxembourg}}

					

@Conference{CitationKey,
author = {K\"{o}hler, Philip and Kr\"{a}mer, Jan and Anandasivam, Arun},
title = {{Cloud Computing: New Business Opportunities for Telecommunications
Companies?}},
booktitle = {2010 European Regional ITS Conference},
year = {2010},
address = {Copenhagen, Denmark},
organization = {International Telecommunications Society},
url = {http://www.econstor.eu/dspace/handle/10419/44316},
key = {Koehler2010c}}

					

@Conference{CitationKey,
author = {Adam, M. T. P. and Kr\"{a}mer, Jan and Weinhardt, Christof},
title = {{Towards Understanding Auction Fever}},
booktitle = {World Meeting of the Economic Science Association (ESA)},
year = {2010},
address = {Copenhagen, Denmark}}

					

@Conference{CitationKey,
author = {Kr\"{a}mer, Jan and Wiewiorra, Lukas},
title = {{The Taxi Meter Effect: An Experimental Approach}},
booktitle = {Group Decision and Negotiation 2010},
year = {2010},
address = {Delft, the Netherlands},
pages = {228-231},
editor = {de Vreede, Gert-Jan},
note = {ISBN: 978-9-056382-36-0}}

					

@Conference{CitationKey,
author = {Elsner, Helmuth and Kr\"{a}mer, Jan},
title = {{Management komplexer Unternehmensportale – Herausforderungen und
L\"{o}sungsans\"{a}tze}},
booktitle = {72. Wissenschaftliche Jahrestagung des Verbandes der Hochschullehrer
f\"{u}r Betriebswirtschaft},
year = {2010},
address = {Bremen, Germany}}

					

@Conference{CitationKey,
author = {Kr\"{a}mer, Jan; Wiewiorra, Lukas},
title = {{Innovation through Discrimination!? - A Formal Analysis of the Net
Neutrality Debate}},
booktitle = {The 8th Annual International Industrial Organization Conference
(IIOC)},
year = {2010},
address = {Vancouver, Canada},
month = {May}}

					

@Conference{CitationKey,
author = {Kr\"{a}mer, Jan and Elsner, Helmut and Weinhardt, Christof},
title = {{The Ricommander - Rating Recommendations  for Corporate Community
Portals}},
booktitle = {11th Group Decision and Negotiation Conference (GDN)},
year = {2010},
address = {Delft, The Netherlands},
abstract = {In this article we point at the large potentials that corporate
community portals can have to support the business model of companies. In
particular corporate community portals of the next generation are characterized
by the integration of business intelligence tools which can facilitate or even
automate many business processes. However, we also emphasize the challenges
for user management that are associated with the evolution of corporate community
portals from information portals into complex enterprise application suites.
More precisely, we highlight the fact that users must be supported with
personalized service recommendations if the full potential of the portal is
to be explored. The key challenge of next generation portal management is to
identify and promote each employee’s individually relevant service set by rating
implicit recommendations of similar users. In this respect, we suggest an
intelligent service called the “Ricommander” which is well suited to perform
this task.}}

					

@Conference{CitationKey,
author = {Elsner, Helmuth and Kr\"{a}mer, Jan},
title = {{Phasen und Herausforderungen bei der Entwicklung eines
Unternehmensportals}},
booktitle = {1. Konferenz zu Mitarbeiterportalen in der Unternehmenspraxis
(MiPo'10)},
year = {2010},
address = {Aalen, Germany},
abstract = {Zur Unterst\"{u}tzung von Finanzprozessen setzt die Finanzabteilung
der Bayer AG seit 2001 auf eine Portall\"{o}sung, die seitdem kontinuierlich
erweitert wurde. Heute  bietet das Portal heute \"{u}ber siebzig verschiedene
Dienste f\"{u}r mehr als 2000 Mitarbeiter weltweit an. Bei der Weiterentwicklung
des Portals wurden drei sich \"{u}berschneidende Phasen durchlaufen: Zun\"{a}chst
wurde das Portal an bestehende Software und Datenquellen angebunden und konnte
somit zuvor heterogene Systeme verkn\"{u}pfen. Anschlie\ssend wurden intelligente
Dienste entwickelt, die die so zusammengef\"{u}hrten Daten zur weiterf\"{u}hrenden
Analyse nutzen, um so wiederum neue Informationen bereitzustellen. Aktuell wird
in der dritten Phase die Einbindung von Wissensmanagement- und
Kollaborations-Diensten vorangetrieben, mit dem Ziel, das Portal als zentrales
Element der Finance-Community zu etablieren. Im Rahmen dieser Phasen wurden
zahlreiche Herausforderungen an das Management von Unternehmensportalen
identifiziert und L\"{o}sungsstrategien vorgeschlagen, die dazu beitragen
k\"{o}nnen, das Portal als zentrale Unternehmensanwendung zu etablieren und
gleichzeitig eine hohe Nutzerakzeptanz zu gew\"{a}hrleisten.}}

					

@Conference{CitationKey,
author = {Adam, M. T. P. and Kr\"{a}mer, Jan and Weinhardt, Christof},
title = {{A Theory of Bid Protraction: Evidence from a Physioeconomic
Experiment}},
booktitle = {Tagung der Gesellschaft f\"{u}r experimentelle Wirtschaftsforschung},
year = {2009},
address = {Essen, Germany}}

					

@Conference{CitationKey,
author = {Adam, Marc T.P. and Kr\"{a}mer, Jan and Weinhardt, Christof},
title = {{The Impact of Clock Speeds on Bidders' Arousal in Dutch Auctions}},
booktitle = {3rd Nordic Conference on Behavioral and Experimental Economics},
year = {2008},
address = {Copenhagen, Denmark},
abstract = {Previous experimental studies suggest that seller's revenue in Dutch
auctions depends on the speed at which the standing price

is decreased. This eect is commonly explained by the fact that auction speed
has a direct eect on bidders' utility of suspense. We provide experimental
evidence that dierent clock speeds indeed have an impact on bidders' emotional
arousal, which in turn influences market behavior and outcome. To this extend
a bidder's skin conductance levels have been measured while participating in
Dutch auctions with varying clock speeds. The main nding of our physio-economic
study is that the degree of emotional arousal is signicantly higher in fast
Dutch auctions. Thereby we provide evidence for the missing link between the
utility of suspense theory and truly experienced competitive arousal.}}

					

@Conference{CitationKey,
author = {Kr\"{a}mer, Jan},
title = {{Bundling as a Leverage Device in Quality Differentiated Duopolies
with Home Markets}},
booktitle = {34th Conference of the European Association for Research in
Industrial Economics (EARIE)},
year = {2007},
address = {Valencia, Spain}}

					

@Unpublished{CitationKey,
author = {Astor, Philipp J. and Adam, Marc T. P. and Kr\"{a}mer, Jan},
title = {{Emotion Induction in First-Price Sealed-Bid Auctions}},
note = {Will be presented at "2011 Annual International Meeting of the Economic
Science Association" (Chicago, USA)},
year = {2011}}

					

@Unpublished{CitationKey,
author = {Kr\"{a}mer, Jan and Conte, Tobias and Blau, Benjamin and van Dinther,
Clemens and Weinhardt, Christof},
title = {{Service Value Networks: Unleashing the Combinatorial Power of Service
Mashups}},
note = {Working Paper, Karlsruhe Institute of Technology},
year = {2010},
url = {http://ssrn.com/abstract=1582902},
abstract = {The long tail phenomenon has been heavily discussed in recent years.
What has been neglected so far is its striking relevance for electronic services.
Whereas consumers’ expectations about information goods are often vague and
transient, their requirements are pronounced and specific when it comes to the
functional and non-functional characteristics of electronic services. Moreover,
modular services can be combined and configured into service mashups that meet
virtually every conceivable consumer requirement. In this vein, the long tail
phenomenon can be leveraged into a new dimension -- the long valley, where every
service exerts positive network externalities on the remaining services, thereby
spurring an increase in supply and demand. The combinatorics of constructible
service mashups are enabled by universally accessible service orchestration
platforms known as Service Value Networks (SVNs). This article shall not only
pave the way for a rising research area on a new business trend, but will also
help business actors to harness the opportunities opened up by SVNs.}}

					

@Unpublished{CitationKey,
author = {Kr\"{a}mer, Anne and Kr\"{a}mer, Jan},
title = {{Flexibility of Delivery Frequency in Logistics Competition}},
note = {Working Paper, Karlsruhe Institute of Technology},
month = {March},
year = {2010},
url = {http://ssrn.com/abstract=1583015},
abstract = {We investigate the strategic impact of flexible delivery frequencies
on the competition of logistics service providers (LSPs) in a supply chain.
LSPs compete for customers who choose an exclusive service provider based on
their individual preference, prices and inventory costs. The service provider
which offers the higher delivery frequency is more attractive to customers,
because inventory holding costs are kept low. In reverse, higher delivery
frequencies entail higher transportation costs for the LSPs (frequency effect),
which is only partially offset by a community cost effect that captures the
economies of scale from larger market share and synergies from increased load
efficiency. We consider a scenario in which only one of the two LSPs can choose
its delivery frequency strategically. Our main result is that flexibility in
frequency choice is only a strategic advantage for the LSP if customers' inventory
holding costs are relatively high compared to transportation costs. In this
case customers especially appreciate the high delivery frequencies and the
flexible LSP is able to satisfy this demand. However, when inventory holding
costs are comparably small with respect to the LSPs' transportation costs, the
inflexible LSP is at an advantage. In this case, inflexibility acts as a credible
strategic commitment which the flexible LSP can only react to. Furthermore,
low inventory holding costs lead to a situation in which the LSP with the flexible
delivery frequency faces the dilemma whether to choose its optimal delivery
frequency and to make less profit than his competitor or to forfeit some of
its own profits in order to make larger profits than the other LSP.}}