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Veröffentlichungen

Prof. Dr. Jens Förderer zählt zu den forschungs­stärksten Wirtschafts­wissenschaft­lern im deutschsprach­igen Raum. Seine Arbeiten erscheinen regelmäßig in führenden Fach­zeitschriften wie Management Science, Information Systems Research und MIS Quarterly. Für seine Forschungs­leistungen wurde er unter anderem mit dem Best Paper of the Year Award der Fach­zeitschrift Information Systems Research ausgezeichnet. Im Forschungs­ranking der Wirtschafts­Woche belegt er gemessen an A+-Publikationen den ersten Platz unter Wirtschafts­wissenschaft­lern unter 40 Jahren im deutschsprach­igen Raum. Zudem wurde er vom Wirtschafts­magazin Capital als einer der Top 40 unter 40 in Deutschland, Österreich und der Schweiz ausgezeichnet.

Auf dieser Seite finden Sie einen Über­blick über die wichtigsten Forschungs­beiträge des Lehr­stuhls. Nachfolgend ist eine vollständige Liste aller Publikationen aufgeführt.

Information Systems Research
Strategic Drivers of Core Expansion on Software Platforms: Evidence from Apple iOS

Halckenhaeusser, A., Förderer, J., Heinzl, A., und Henfridsson, O. (2025). Information Systems Research, 0(0).

Software platforms are extensible systems built on a core-periphery model, where the platform owner provides a foundational code base that third-party developers can leverage for complementary apps. This model incentivizes software platform owners to enlarge the overall value generated by the eco­system, thereby increasing their share of the revenues, rather than competing directly with third-party developers by offering apps themselves. As part of this strategy, platform owners nevertheless intermittently expand their core to cover functionality that has once resided in the periphery. What are the drivers behind such core expansion into eco­system niches? We meticulously assembled a large-scale data set of all Apple’s core expansions on the iOS platform from 2012 to 2020, encompassing both stand-alone apps and features integrated into the core, to examine these drivers. The findings support our hypotheses that niches characterized by low user satisfaction, low levels of innovation efforts, and higher market concentration are more likely to be targets for core expansion. Core expansion through stand-alone apps manifests in niches with low levels of innovation efforts, whereas core expansion through integration of features into the platform core manifests in niches with low user satisfaction and high market concentration. Our study extends the software platform literature by hypothesizing and testing the drivers behind a platform owner’s core expansion into eco­system niches.

MIS Quarterly
Does Ransomware Make Investors “WannaCry”? On Investors’ Divergent Reactions to Ransomware Hits and Near Misses

Schuetz, S.W., Chen, Y., Förderer, J. und Ma, Y. (2025). MIS Quarterly, 49 (3): 1153–1168.

In recent years, ransomware has become one of the most dangerous cyber threats, with successful attacks causing severe operational disruptions and staggering damages. Rationally speaking, investors should react negatively to firms’ ransomware disclosures, but this may not always be the case. Based on norm theory, we describe a paradoxical phenomenon wherein investors exhibit negative reactions to ransomware hits (i.e., events that led to operational disruptions) but positive reactions to near misses (i.e., events in which operational disruptions were narrowly avoided). The positive reactions occur due to an outcome bias in which near-miss events—events that are objectively negative but less severe than expected—are viewed positively instead of negatively. We tested these predictions by reporting on an investigation of stock market reactions to disclosures of ransomware hits vs. near misses. To do so, we assembled a comprehensive dataset of ransomware incidents disclosed by U.S. public firms. Using the event study method, we estimated abnormal stock market returns and found evidence in support of our predictions. First, in line with expectations, ransomware hits that led to the expected severe impact resulted in stock price drops of -4.40%. However, near misses, where disruptions were avoided, were rewarded with gains of 2.87%, confirming positive instead of negative reactions. This offers new insights into investors’ biased responses to certain cybersecurity incidents. These positive reactions, however, represent a call for caution because, albeit seemingly favorable, they mask underlying risks.

Information Systems Research
Star Wars: An Empirical Study of Star Performer Turnover and Content Supply on Multisided Streaming Platforms

Förderer, J., Gutt, D. und Greenwood, B.N. (2025). Information Systems Research, 0(0).

Competition between user-generated content platforms (e.g., Twitch, Spotify, YouTube) is characterized by fierce talent poaching of highly popular “stars” on the supply side. However, little is known about how the loss of a star affects content production from former cocreating peers on multisided content platforms. Whereas theory suggests that star turnovers might decrease the demand for cocreating peers or trigger them to depart the platform as well, empirical understanding is still lacking. To address this gap, we examine the defection of Fortnite star Richard Tyler “Ninja” Blevins from Twitch.tv to Microsoft Mixer in 2019 using a quasi-experimental research design and novel streamer-level data. Findings are fourfold. First, the turnover of a star decreases peer creators’ content contribution by −20.4%, suggesting that the departure of a star contracts supply for the platform overall. Second, the negative star turnover effect on content contribution is lesser for creators who have a diversified content portfolio and are relatively more popular. Third, evidence suggests that the overall negative effect operates through a downsizing rather than desertion mechanism, (i.e., remaining creators reduce their contribution rather than abandoning the platform entirely). Finally, creators experiment with shifting their focus to other types of content but eventually abandon these efforts. We conclude that star turnover can cause both primary and spillover losses in content supplied to a platform. Our findings have implications for platform management, the content strategy of creators, and our understanding of stars’ influence on multisided content platforms.

Cover des Journals Management Science
Estimating career benefits from online community leader­ship: Evidence from stack exchange moderators

Förderer, J. und Burtch, G. (2024). Management Science, 71, 1–24.

Many IT professionals seek to improve their job prospects by engaging as leaders of online communities, for example, by serving as a moderator or admin. We investigate whether such community leader­ship leads to (causal) improvements in individuals’ careers. We assemble a data set, including job histories of IT professionals who have sought election as moderators (mods) in Stack Exchange question-and-answer communities, between 2010 and 2020. We estimate the career benefits of moderator­ship under two complementary identification strategies: difference-in-differences (DID) and regression discontinuity (RD). We observe qualitatively consistent results under each design, finding that election to a moderator role has a significant, causal, positive effect on job mobility. We estimate that moderator­ship increases the probability of a job change by between 4.7 and 12.3 percentage points over the two years following the election. We also report a series of secondary analyses that speak to associated salary increases and show evidence consistent with the notion that social capital and signaling play a role. Our findings help us understand the benefits of online community leader­ship, and they extend our understanding of the motivations for online community engagement.

Cover des Journals Management Science
Ban targeted advertising? An empirical investigation of the consequences for app development

Kircher, T. und Förderer, J. (2024). Management Science, 70, 1070-1092.

On many multisided app platforms, the supply-side monetizes their work with targeted advertising. The targeting of ads has raised concerns over user privacy and has led to calls for platform firms and regulators to bar this practice. Important for this debate is to understand the consequences that a ban on targeted advertising would have for app development. To inform, we exploit that Google, in 2019, banned targeted advertising in Android children’s games. This setting represents an ideal real-world laboratory and permits a quasi-experimental research design. Our overall finding is that the ban on targeted advertising caused substantial app abandonment. The ban reduced the release of feature updates, particularly for games of young, undiversified, and advertisement-dependent firms. Only games of exceptionally high quality and demand showed an increase in development. Corroborating this picture, affected games were more likely to be delisted. Developers shifted their efforts toward their unaffected games and released fewer new games on average. Further tests substanti­ate that targeted advertising represented a crucial form of monetization for affected games and that the ban obliterated ad revenues used for app development. Our findings have several implications. To avoid a loss in app innovation, platform firms should consider implementing measures to reduce the burden on developers, especially by creating alternative monetization opportunities. Consumers and policymakers should be aware that targeted advertising plays a crucial role for app development and can use our estimates for designing policies. Thus, consumers’ demand for privacy can conflict with platform firms’ goal to foster app innovation.

Cover des Journals of Operations Management
How deadline orientation and architectural modularity influence software quality and job satisfaction

Kude, T., Förderer, J., Mithas, S. und Heinzl, A. (2023). Journal of Operations Management, 69, 941–964.

The implementation of digital trans­formation programs requires careful allocation of software developers to a variety of digital products and services with different levels of modularity. This paper investigates how deadline orientation (an individual-level preference of developers for completing work close to deadlines) and architectural modularity (a characteristic of products) influence central outcomes in software development. We argue that architectural modularity positively interacts with deadline orientation to influence software quality and the job satisfaction of developers. Our empirical analyses, using rare and high-quality data from 131 software developers and 29 product owners working at a captive software development center in India of a leading global software firm, confirm our hypotheses. We contribute to the literature on software development by showing that the fit between the technological characteristics of the software product (i.e., architectural modularity) and people factors (i.e., the temporal work style preferences of developers) plays an important role in shaping both software quality and job satisfaction. Our study has wider implications for the literature on software development, temporal work styles, and architectural modularity. It is instructive for practitioners tasked with hiring or allocating software developers for software products with varying technological characteristics in their digital trans­formation efforts.

Cover des Journals Management Science
Data breach announcements and stock market reactions: A matter of timing?

Förderer, J. und Schütz, S. W. (2022). Management Science, 68, 7298-7322.

Although firms’ announcement of data breaches can lead to reputational or operational damages, extant research suggests that stock markets are relatively unresponsive to such announcements. We investigate whether markets’ unresponsiveness can be explained by firms strategically timing the announcement to coincide with busy days in the media, thereby reducing attention and, ultimately, attenuating market reactions. We leverage novel data on data breach announcements in the United States between 2008 and 2018 and create a measure of busyness in the trade press—news pressure—based on the Wall Street Journal. To investigate, we conduct two complementary studies. In Study 1, we employ an instrumental variable approach to assess whether announcements coincide with days of predictably high news pressure. We find that this is the case. On days with a one-standard-deviation-higher predictable news pressure, 4.44% more data breaches are announced (or approximately 19.024 data records). Strategic timing is more prevalent for breaches that are severe, that have firm-internal causes, and that leak healthcare data or credentials. In Study 2, we utilize a stock market event study to assess market reactions conditional on news pressure on the announcement day. We find that data breach announcements are associated with negative market reactions, yet these are attenuated by higher news pressure on the announcement day. If news pressure is on its empirical mean (respectively, one standard deviation above), we estimate a median decline in market capitalization of $347 (respectively, $85) million. We conclude that firms’ strategic timing might explain inconsistent findings in prior work.

Cover des Journals HMD: Praxis der Wirtschafts­informatik
Qualitätssicherung in Digitalen Plattform-Öko­systemen: Implementierung von Kontroll­systemen am Beispiel von Apple iOS

Lindenmayr, M. und Foerderer, J. (2022). HMD : Praxis der Wirtschafts­informatik, 59, 1312-1322.

Um sich in einem kompetitiven Wettbewerbsumfeld weiterzuentwickeln und Netzwerkeffekte zu realisieren, setzen Plattformen externe App-Entwickler zur Erweiterung von Mobile-Apps-Plattformen ein. Damit können Plattformbetreiber den Wert für Konsumenten steigern. Gleich­zeitig verlieren sie aber die vollständige Kontrolle über die Plattform und Qualitätsmängel in Form von fehlerhaften oder geringwertigen Apps treten auf. Dies macht Mechanismen zur Qualitätssteuerung erforderlich. Dabei implementieren Plattformbetreiber Kontroll­systeme, die Rahmenbedingungen für die Interaktion in Plattform-Öko­systemen festlegen. Kontrollen und Sanktionen setzen die Einhaltung der Regeln durch. Dieser Beitrag beschreibt den Prozess der Qualitätssicherung auf Mobile-Apps-Plattformen. Dabei werden am Beispiel von Apple iOS werden die vorgestellten Maßnahmen evaluiert. Diese Er­kenntnisse können von anderen Plattformbetreibern genutzt werden, um eine hohe Qualität ihrer Plattform sicherzustellen.

Cover des Journals Information Systems Research
And the winner is …? The desirable and undesirable effects of platform awards

Förderer, J., Lüker, N. und Heinzl, A. (2021). Information Systems Research : ISR, 32, 1155-1172.

We study platform firms’ decision to recognize innovation by complementors ex post through awards. Despite being purely symbolic, awards might set incentives for complementors’ product strategies that can eventually lead to both desirable and undesirable outcomes for the platform firm. We depart from signaling theory and derive hypotheses on the effects of awards on complementors’ product strategies. To test them, we implement a quasi-experiment in the context of the Google Android mobile platform and the prestigious Google Play Award. We infer the effect of the award by estimating the difference-in-differences between award winners and runners-up, before and after the conferral. The main sample encompasses 125 award nominees and their 793 apps between 2016 and 2018. We report three findings. First, the award encourages recipients to focus on releasing complement improvements rather than new complements. Second, the award increases recipients’ likelihood of multihoming. Finally, the award increases new complement releases in the recipients’ market niche by attracting other complementors. We contribute to the platform governance literature by informing about the effects of awards. Additionally, our findings have theoretical implications for understanding “soft” platform governance mechanisms.

Cover des Journals Management Science
Interfirm exchange and innovation in platform eco­systems: evidence from Apple’s Worldwide Developers Conference

Förderer, J. (2020). Management Science, 66, 4772-4787.

Platform firms’ success depends on complementary innovation. This paper studies the relation between opportunities for interfirm exchange and complementary innovation. An empirical study of a sample of app developer firms attending Apple’s 2016 Worldwide Developers Conference suggests three findings. First, the opportunity to exchange stimulated innovation in the form of major app updates that received positive consumer feedback. Second, the effects were more pronounced for older and larger firms, potentially because these firms have more experience and resources to leverage exchanges and safeguard against knowledge spillovers. Third, part of the effects may be attributed to learning and collaborations.

Cover des Information Systems Journals
Knowledge boundaries in enterprise software platform development: Antecedents and consequences for platform governance

Förderer, J., Kude, T., Schütz, S.W., und Heinzl, A. (2019). Information Systems Journal, 29, 119–144.

The widespread uptake of platform strategies turns many vendors of enterprise software into curators of an eco­system of firms that collaboratively develop and commercialize a shared technology. As a platform owner's effectiveness in integrating knowledge across eco­system participants will distinguish it from its competitors, we investigate the management of development-related knowledge across firm boundaries. Our exploratory, multiple-case study of 4 platforms illustrates how “knowledge boundaries” emerge between platform owners and complementors. We observe that knowledge boundaries are influenced by a platform's functional extent, interface design, and evolutionary dynamics, which create differences, dependencies, and novelty of development knowledge, resulting in qualitatively distinct types of knowledge boundaries. To overcome knowledge boundaries, platform owners provide various resources at the boundary, including information portals, documentation, helpdesks, and alignment workshops. We observe that in shaping these resources, platform owners face a trade-off between providing knowledge at the right scope, while allowing for the scalability of knowledge resources for the entire eco­system. Depending on their scope and scale, we classify knowledge boundary resources as broadcasting, brokering, and bridging, each representing qualitatively distinct patterns in managing knowledge in platform eco­systems. We conclude with implications for researchers and managers.

Cover des Journals Information Systems Research
Does platform owner’s entry crowd out innovation? Evidence from Google photos

Förderer, J., Kude, T., Mithas, S., und Heinzl, A. (2018). Information Systems Research : ISR, 29, 444–260.

We study how platform owners’ decision to enter complementary markets affects innovation in the eco­system surrounding the platform. Despite heated debates on the behavior of platform owners toward complementors, relatively little is known about the mechanisms linking platform owners’ entry and complementary innovation. We exploit Google’s 2015 entry into the market for photography apps on its own Android platform as a quasi-experiment. We conclude based on our analyses of a time-series panel of 6,620 apps that Google’s entry was associated with a substantial increase in complementary innovation. We estimate that the entry caused a 9.6% increase in the likelihood of major updates for apps affected by Google’s entry, compared to similar but not affected apps. Further analyses suggest that Google’s entry triggered complementary innovation because of the increased consumer attention for photography apps, instead of competitive “racing” or “Red Queen” effects. This attention spillover effect was particularly pronounced for larger and more diversified complementors. The study advances our understanding of the effects of platform owner’s entry, explicates the complex mechanisms that shape complementary innovation, and adds empirical evidence to the debate on regulating platforms.

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