Prof. Michael Kummer, PhD

Hinnosaar, Marit, Toomas Hinnosaar, Michael Kummer und Olga Slivkó (2021), Wikipedia Matters, Journal of Economics & Management Strategy. Download

Kummer, Michael, Olga Slivkó und Xiaoquan (Michael) Zhang (2020), Unemployment and Digital Public Goods Contribution, Information Systems Research . Download

Breunig, Christoph, Michael Kummer, Jörg Ohnemus und Steffen Viete (2019), IT Outsourcing and Firm Productivity: Eliminating Bias from Selective Missingness in the Dependent Variable, The Econometrics Journal Volume 23, Issue 1, 88 - 114. Download

Schulte, Patrick und Michael Kummer (2019), When Private Information Settles the Bill: Money and Privacy in Google’s Market for Smartphone Applications, Management Science Volume 65, Issue 8, 3449-3947. Download

Kummer, Michael, Marianne Saam, Iassen Halatchliyski und George Giorgidze (2016), Centrality and Content Creation in Networks - The Case of Economic Topics on German Wikipedia, Information Economics and Policy Volume 36, Issue C, 36-52. Download

Hackl, Franz, Michael Kummer, Rudolf Winter-Ebmer und Christine Zulehner (2014), Market Structure and Market Performance in E-Commerce, European Economic Review 68, 199 - 218. Download

Hackl, Franz, Michael Kummer und Rudolf Winter-Ebmer (2014), 99 Cent: Price Points in E-Commerce, Information Economics and Policy 26, 12 - 27. Download

Slivkó, Olga, Michael Kummer und Marianne Saam (2016), Identification of Causal Effects in the Context of Mass Collaboration , in: Cress, Ulrike, Johannes Moskaliuk and Heisawn Jeong Mass Collaboration and Education, Computer-Supported Collaborative Learning Series, Bd. 16, Springer 391-411. Download

Kummer, Michael (2014), ICT, Search Behavior and Market Outcomes, Dissertation, Mannheim. Download

Giorgidze, George , Torsten Grust, Iassen Halatchliyski und Michael Kummer (2013), Analysing the entire Wikipedia history with Database Supported Haskell, in: Kostis Sagonas Practical Aspects of Declarative Languages, 15th International Symposium, PADL 2013, Rome, Italy, January 21-22, 2013, Proceedings Series: Lecture Notes in Computer Science, Bd. Vol. 7752, Springer, Rome, Italy,. Download

Kummer, Michael, Ulrich Laitenberger, Cyrus E. Rich, Danny R. Hughes und Turgay Ayer (2021), Healthy Reviews! Online Physician Ratings Reduce Healthcare Interruptions, ZEW Discussion Paper No. 21-075, Mannheim. Download

Chen, Xiaomeng, Chris Forman und Michael Kummer (2021), Chat More and Contribute Better: An Empirical Study of a Knowledge-Sharing Community, ZEW Discussion Paper No. 21-061, Mannheim. Download

Kesler, Reinhold, Michael Kummer und Patrick Schulte (2019), Competition and Privacy in Online Markets: Evidence from the Mobile App Industry, ZEW Discussion Paper No. 19-064, Mannheim. Download

Hinnosaar, Marit, Toomas Hinnosaar, Michael Kummer und Olga Slivkó (2019), Externalities in Knowledge Production: Evidence from a Randomized Field Experiment, ZEW Discussion Paper No. 19-007, Mannheim. Download

Borchert, Kathrin, Matthias Hirth, Michael Kummer, Ulrich Laitenberger, Olga Slivkó und Steffen Viete (2018), Unemployment and Online Labor, ZEW Discussion Paper No. 18-023, Mannheim. Download

Kesler, Reinhold, Michael Kummer und Patrick Schulte (2017), Mobile Applications and Access to Private Data: The Supply Side of the Android Ecosystem, ZEW Discussion Paper No. 17-075, Mannheim. Download

Breunig, Christoph, Michael Kummer, Jörg Ohnemus und Steffen Viete (2016), IT Outsourcing and Firm Productivity: Eliminating Bias from Selective Missingness in the Dependent Variable, ZEW Discussion Paper No. 16-092, Mannheim. Download

Kummer, Michael und Patrick Schulte (2016), When Private Information Settles the Bill: Money and Privacy in Google’s Market for Smartphone Applications, ZEW Discussion Paper No. 16-031, Mannheim. Download

Hinnosaar, Marit, Toomas Hinnosaar, Michael Kummer und Olga Slivkó (2015), Does Wikipedia Matter? The Effect of Wikipedia on Tourist Choices, ZEW Discussion Paper No. 15-089, Mannheim. Download

Kummer, Michael, Olga Slivkó und Michael Zhang (2015), Economic Downturn and Volunteering: Do Economic Crises Affect Content Generation on Wikipedia?, ZEW Discussion Paper No. 15-078, Mannheim. Download

Kummer, Michael (2014), Spillovers in Networks of User Generated Content: Pseudo-Experimental Evidence on Wikipedia, ZEW Discussion Paper No. 14-132, Mannheim. Download

Kummer, Michael und Patrick Schulte (2014), Money and Privacy – Android Market Evidence, ZEW Discussion Paper No. 14-131, Mannheim. Download

Hackl, Franz, Michael Kummer, Rudolf Winter-Ebmer und Christine Zulehner (2013), Entry, Exit, and Pricing Strategies at Online Price-Comparison Sites, Do Price Markups Fall by Themselves, or Is Competition Crucial?, ZEW policy brief Nr. 13-02, Mannheim. Download

Giorgidze, George, Torsten Grust, Iassen Halatchliyski und Michael Kummer (2013), Analysing the entire Wikipedia history with Database Supported Haskell, Tübingen. Download

Kummer, Michael (2013), Spillovers in Networks of User Generated Content – Evidence from 23 Natural Experiments on Wikipedia, ZEW Discussion Paper No. 13-098, Mannheim. Download

Kummer, Michael, Marianne Saam, Iassen Halatchliyski und George Giorgidze (2012), Centrality and Content Creation in Networks – The Case of German Wikipedia, ZEW Discussion Paper No. 12-053, Mannheim. Download

Hackl, Franz, Michael Kummer, Rudolf Winter-Ebmer und Christine Zulehner (2011), Market Structure and Market Performance in E-Commerce, ZEW Discussion Paper No. 11-084, Mannheim. Download

Hackl, Franz, Michael Kummer und Rudolf Winter-Ebmer (2010), 99 Cent: Price Points in E-Commerce, ZEW Discussion Paper No. 10-022, Mannheim. Download