Open collaboration for innovation: Principles and performance

Organization Science

Volumn 25, Issue 5, 2014, Pages 1414-1433

  Levine, Sheen S ^a   Prietula, Michael J ^b  

^a Och Spine at New York Presbyterian Hospitals   (United States)

^b EMORY UNIVERSITY   (United States)

Author keywords

Community; Crowdsourcing; Economics; Entrepreneurship; Innovation; Model; Open source; Performance; Psychology; Simulation; Software; Strategy; Wikipedia

Indexed keywords

EID: 84907583333     PISSN: 10477039     EISSN: 15265455     Source Type: Journal    
DOI: 10.1287/orsc.2013.0872     Document Type: Article

References (164)

1. Adler PS, Kwon S-W, Heckscher C (2008) Professional work: The emergence of collaborative community. Organ. Sci. 19(2): 359-376.
2. Afuah A, Tucci CL (2012) Crowdsourcing as a solution to distant search. Acad. Management Rev. 37(3):355-375.
3. Alexander RD (1987) The Biology of Moral Systems (Aldine de Gruyter, New York).
4. Anthony D, Smith SW, Williamson T (2009) Explaining quality in Internet collective goods: Zealots and Good Samaritans in the case of Wikipedia. Ration Soc. 21(3):283-306.
5. Axelrod R (1984) The Evolution of Cooperation (Basic Books, New York).
6. Bagozzi RP, Dholakia UM (2006) Open source software user communities: A study of participation in Linux user groups. Management Sci. 52(7):1099-1115.
7. Baker WE, Levine SS (2013) Mechanisms of generalized exchange: Towards an integrated model. Working paper, University of Michigan, Ann Arbor. http://ssrn.com/abstractD1352101.
8. Baldwin CY (2008) Where do transactions come from? Modularity, transactions, and the boundaries of firms. Indust. Corporate Change 17(1):155-195.
9. Baldwin CY, Clark KB (2006) The architecture of participation: Does code architecture mitigate free riding in the open source development model? Management Sci. 52(7):1116-1127.
10. Baldwin CY, von Hippel E (2011) Modeling a paradigm shift: From producer innovation to user and open collaborative innovation. Organ. Sci. 22(6):1399-1417.
11. Baldwin CY, Hienerth C, von Hippel E (2006) How user innovations become commercial products: A theoretical investigation and case study. Res. Policy 35(9):1291-1313.
12. Bambauer DE, Day O (2011) The Hacker's aegis. Emory Law J. 60(5):1051-1107.
13. Benkler Y (2002) Coase's penguin, or, Linux and The Nature of the Firm. Yale Law J. 112(3):369-446.
14. Benkler Y (2004) Commons-based strategies and the problems of patents. Science 305(5687):1110-1111.
15. Benkler Y (2006) The Wealth of Networks: How Social Production Transforms Markets and Freedom (Yale University Press, New Haven, CT).
16. Benkler Y (2011) The Penguin and the Leviathan: The Triumph of Cooperation Over Self-Interest (Crown Business, New York).
17. Benkler Y, Nissenbaum H (2006) Commons-based peer production and virtue. J. Politics Philos. 14(4):394-419.
18. Bolton GE, Katok E, Ockenfels A (2005) Cooperation among strangers with limited information about reputation. J. Public Econom. 89(8):1457-1468.
19. Bonaccorsi A, Rossi C (2003) Why open source software can succeed. Res. Policy 32(7):1243-1258.
20. Bonaccorsi A, Giannangeli S, Rossi C (2006) Entry strategies under competing standards: Hybrid business models in the open source software industry. Management Sci. 52(7):1085-1098.
21. Burton RM, Obel B (2011) Computational modeling for what-is, what-might-be, and what-should-be studies-And triangulation. Organ. Sci. 22(5):1195-1202.
22. Casadesus-Masanell R, Ghemawat P (2006) Dynamic mixed duopoly: A model motivated by Linux vs. Windows. Management Sci. 52(7):1072-1084.
23. Chatterji AK, Fabrizio K (2012) How do product users influence corporate invention? Organ. Sci. 23(4):971-987.
24. Chaudhuri A (2010) Sustaining cooperation in laboratory public goods experiments: A selective survey of the literature. Experiment. Econom. 14(1):47-83.
25. Chaudhuri A, Paichayontvijit T (2006) Conditional cooperation and voluntary contributions to a public good. Econom. Bull. 3(8): 1-14.
26. Chen Y, Xie J (2008) Online consumer review: Word-of-mouth as a new element of marketing communication mix. Management Sci. 54(3):477-491.
27. Chevalier JA, Mayzlin D (2006) The effect of word of mouth on sales: Online book reviews. J. Market Res. 43(3):345-354.
28. Cinyabuguma M, Page T, Putterman L (2005) Cooperation under the threat of expulsion in a public goods experiment. J. Public Econom. 89(8):1421-1435.
29. Cooley CH (1909) Social Organization: A Study of the Larger Mind (Charles Scribner's Sons, New York).
30. Cornes R, Sandler T (1984) Easy riders, joint production, and public goods. Econom. J. 94(375):580-598.
31. Cornes R, Sandler T (1986) The Theory of Externalities, Public Goods, and Club Goods (Cambridge University Press, Cambridge, UK).
32. Cyert R, March JG (1963) A Behavioral Theory of the Firm (Prentice Hall, Englewood Cliffs, NJ).
33. Dahlander L, O'Mahony S (2011) Progressing to the center: Coordinating project work. Organ. Sci. 22(4):961-979.
34. Dahlander L, Wallin MW (2006) A man on the inside: Unlocking communities as complementary assets. Res. Policy 35(8): 1243-1259.
35. David PA (1998) Common agency contracting and the emergence of "open science" institutions. Amer. Econom. Rev. 88(2):15-21.
36. Davis JP, Eisenhardt KM, Bingham CB (2007) Developing theory through simulation methods. Acad. Management Rev. 32(2): 480-499.
37. Dawes RM, Thaler RH (1988) Anomalies: Cooperation. J. Econom. Perspect. 2(3):187-197.
38. Dawes RM, McTavish J, Shaklee H (1977) Behavior, communication, and assumptions about other people's behavior in a commons dilemma situation. J. Personality Soc. Psych. 35(1):1-11.
39. DiMaggio PJ (1995) Comments on "What theory is not." Admin. Sci. Quart. 40(3):391-397.
40. Dreber A, Rand DG, Fudenberg D, Nowak MA (2008) Winners don't punish. Nature 452(7185):348-351.
41. Economides N, Katsamakas E (2006) Two-sided competition of proprietary vs. open source technology platforms and the implications for the software industry. Management Sci. 52(7): 1057-1071.
42. Edgeworth FY (1881) Mathematical Psychics: An Essay on the Application of Mathematics to the Moral Sciences (A.M. Kelley, New York).
43. Ekeh PP (1974) Social Exchange Theory: The Two Traditions (Harvard University Press, Cambridge, MA).
44. European Commission (2006) Study on the: Economic impact of open source software on innovation and the competitiveness of the information and communication technologies (ICT) sector in the EU. Report, European Commission, Brussels.
45. Faraj S, Johnson SL (2010) Network exchange patterns in online communities. Organ. Sci. 22(6):1464-1480.
46. Faraj S, Jarvenpaa SL, Majchrzak A (2011) Knowledge collaboration in online communities. Organ. Sci. 22(5):1224-1239.
47. Fehr E, Fischbacher U (2003) The nature of human altruism. Nature 425(6960):785-791.
48. Fehr E, Gächter S (2000) Cooperation and punishment in public goods experiments. Amer. Econom. Rev. 90(4):980-994.
49. Feller J, Fitzgerald B, Hissam SA, Lakhani KR, eds. (2005) Perspectives on Free and Open Source Software (MIT Press, Cambridge, MA).
50. Fischbacher U, Gächter S (2010) Social preferences, beliefs, and the dynamics of free riding in public goods. Amer. Econom. Rev. 100(1):541-556.
51. Fischbacher U, Gächter S, Fehr E (2001) Are people conditionally cooperative? Evidence from a public goods experiment. Econom. Lett. 71(3):397-404.
52. Fowler JH, Christakis NA (2010) Cooperative behavior cascades in human social networks. Proc. Natl. Acad. Sci. USA 107(12): 5334-5338.
53. Franke N, Shah S (2003) How communities support innovative activities: An exploration of assistance and sharing among end-users. Res. Policy 32(1):157-178.
54. Franke N, von Hippel E (2003) Satisfying heterogeneous user needs via innovation toolkits: The case of Apache security software. Res. Policy 32(7):1199-1215.
55. Franke N, Reisinger H, Hoppe D (2009) Remaining within-cluster heterogeneity: A meta-analysis of the "dark side" of clustering methods. J. Marketing Management 25(3-4):273-293.
56. Gächter S, Thöni C (2005) Social learning and voluntary cooperation among like-minded people. J. Eur. Econom. Assoc. 3(2-3): 303-314.
57. Gächter S, Renner E, Sefton M (2008) The long-run benefits of punishment. Science 322(5907):1510.
58. Ghosh RA (1998) Cooking pot markets: An economic model for trade in free goods and services on the Internet. First Monday 3(3) http://firstmonday.org/ojs/index.php/fm/article/view/580/501.
59. Giles J (2005) Internet encyclopaedias go head to head. Nature 438(7070):900-901.
60. Glass RL (2000) The sociology of open source: Of cults and cultures. IEEE Software 17(3):104-105.
61. Goodman JD (2010) Learning to share, thanks to the Web. New York Times (September 27) WK2.
62. Greenstein S, Zhu F (2012) Is Wikipedia biased? Amer. Econom. Rev. 102(3):343-348.
63. Häfliger S, von Krogh G, Späth S (2008) Code reuse in open source software. Management Sci. 54(1):180-193.
64. Hardin G (1968) The tragedy of the commons. Science 162(3859): 1243-1248.
65. Harhoff D, Henkel J, von Hippel E (2003) Profiting from voluntary information spillovers: How users benefit by freely revealing their innovations. Res. Policy 32(10):1753-1769.
66. Harrison JR, Zhiang L, Carroll GR, Carley KM (2007) Simulation modeling in organizational and management research. Acad. Management Rev. 32(4):1229-1245.
67. Heckscher CC, Adler PS (2006) The Firm as a Collaborative Community: Reconstructing Trust in the Knowledge Economy (Oxford University Press, New York).
68. Helft M (2007) With tools on Web, amateurs reshape mapmaking. New York Times (July 27) http://www.nytimes.com/2007/07/27/technology/27maps.html.
69. Henkel J (2006) Selective revealing in open innovation processes: The case of embedded Linux. Res. Policy 35(7):953-969.
70. Henkel J, Maurer SM (2007) The economics of synthetic biology. Molecular Systems Biol. 3:117.
71. Henkel J, Maurer SM (2009) Parts, property and sharing. Nature Biotechnol. 27(12):1095-1098.
72. Hess C, Ostrom E (2006) Introduction. Hess C, Ostrom E, eds. Understanding Knowledge as a Commons: From Theory to Practice (MIT Press, Cambridge, MA), 3-26.
73. Hollingshead AB (2001) Cognitive interdependence and convergent expectations in transactive memory. J. Personality Soc. Psych. 81(6):1080-1089.
74. Hong L, Page SE (2004) Groups of diverse problem solvers can outperform groups of high-ability problem solvers. Proc. Natl. Acad. Sci. USA 101(46):16385-16389.
75. Ishii K, Kurzban R (2008) Public goods games in Japan: Cultural and individual differences in reciprocity. Human Nature 19(2):138-156.
76. Jarvenpaa SL, Majchrzak A (2008) Knowledge collaboration among professionals protecting national security: Role of transactive memories in ego-centered knowledge networks. Organ. Sci. 19(2):260-276.
77. Jeppesen LB, Lakhani KR (2010) Marginality and problem solving effectiveness in broadcast search. Organ. Sci. 21(5):1016-1033.
78. Kemp MC (1987) Gains from trade. Eatwell J, Milgate M, Newman P, eds. The New Palgrave: A Dictionary of Economics (Palgrave Macmillan, London), 453-454.
79. Kollock P (1999) The economics of online cooperation: Gifts and public goods in cyberspace. Smith MA, Kollock P, eds. Communities in Cyberspace (Routledge, New York), 220-239.
80. Kuk G (2006) Strategic interaction and knowledge sharing in the KDE developer mailing list. Management Sci. 52(7):1031-1042.
81. Kumar V, Gordon BR, Srinivasan K (2011) Competitive strategy for open source software. Marketing Sci. 30(6):1066-1078.
82. Kurzban RO, Houser D (2005) An experimental investigation of cooperative types in human groups: A complement to evolutionary theory and simulations. Proc. Natl. Acad. Sci. USA 102(5): 1803-1807.
83. Lakhani KR, von Hippel E (2003) How open source software works: Free user to user assistance. Res. Policy 32(6):923-943.
84. Lancashire D (2001) Code, culture and cash: The fading altruism of open source development. First Monday 6(12) http://firstmonday.org/issues/issue6_12/lancashire/index.html.
85. Lauterbach D, Truong H, Shah T, Adamic L (2009) Surfing a web of trust: Reputation and reciprocity on CouchSurfing.com. Comput. Sci. Engrg. (CSE '09), Vol. 4 (IEEE, Piscataway, NJ), 346-353.
86. Leach J (2004) A Course in Public Economics (Cambridge University Press, Cambridge, UK).
87. Lee GK, Cole RE (2003) From a firm-based to a community-based model of knowledge creation: The case of the Linux Kernel Development. Organ. Sci. 14(6):633-649.
88. Lenth RV (2001) Some practical guidelines for effective sample-size determination. Amer. Statist. 55(3):187-193.
89. Lerner J, Tirole J (2002) Some simple economics of open source. J. Indust. Econom. 50(2):197-234.
90. Lerner J, Tirole J (2005) Economic perspectives on open source. Feller J, Fitzgerald B, Hissam SA, Lakhani KR, eds. Perspectives on Free and Open Source Software (MIT Press, Cambridge, MA), 47-78.
91. Lessig L (2005) Open code and open societies. Feller J, Fitzgerald B, Hissam SA, Lakhani KR, eds. Perspectives on Free and Open Source Software (MIT Press, Cambridge, MA), 349-360.
92. Levati M, Morone A, Fiore A (2009) Voluntary contributions with imperfect information: An experimental study. Public Choice 138(1):199-216.
93. Levine SS (2001) Kindness in cyberspace? The sharing of valuable goods on-line. Gattiker UE, ed. Best Paper Proc., EICAR Internat. Conf. (IECAR, Aalborg, Denmark), 86-112.
94. Levine SS, Prietula MJ (2012) How knowledge transfer impacts performance: A multilevel model of benefits and liabilities. Organ. Sci. 23(6):1748-1766.
95. Levinthal DA, March JG (1981) A model of adaptive organizational search. J. Econom. Behav. Organ. 2(4):307-333.
96. Lewis K, Lange D, Gillis L (2005) Transactive memory systems, learning, and learning transfer. Organ. Sci. 16(6):581-598.
97. Lin T (2012) Cracking open the scientific process. New York Times (January 17) D1.
98. MacCormack A, Rusnak J, Baldwin CY (2006) Exploring the structure of complex software designs: An empirical study of open source and proprietary code. Management Sci. 52(7):1015-1030.
99. Macy MW, Skvoretz J (1998) The evolution of trust and cooperation between strangers: A computational model. Amer. Sociol. Rev. 63(5):638-660.
100. Macy MW, Willer R (2002) From factors to actors: Computational sociology and agent-based modeling. Annual Rev. Sociol. 28:143-166.
101. Madey G, Freeh V, Tynan R (2004) Modeling the free/open source software community: A quantitative investigation. Koch S, ed. Free/Open Source Software Development (Idea Group, Hershey, PA), 2043-2057.
102. Madison MJ, Frischmann BM, Strandburg KJ (2010) Constructing commons in the cultural environment. Cornell Law Rev. 95: 657-709.
103. Marengo L, Pasquali C (2010) Non rivalry and complementarity in computer software. Working paper, University Library of Munich, Munich. http://mpra.ub.uni-muenchen.de/25589.
104. Maurer SM, Scotchmer S (2006) Open source software: The new intellectual property paradigm. Hendershott T, ed. Economics and Information Systems (Elsevier, New York), 285-322.
105. Merton RK (1967) On Theoretical Sociology (Free Press, New York).
106. Mockus A, Fielding RT, Herbsleb JD (2005) Two case studies of open source software development: Apache and Mozilla. Feller J, Fitzgerald B, Hissam SA, Lakhani KR, eds. Perspectives on Free and Open Source Software (MIT Press, Cambridge, MA), 163-209.
107. Molm LD, Collett JL, Schaefer DR (2007) Building solidarity through generalized exchange: A theory of reciprocity. Amer. J. Sociol. 113(1):205-242.
108. Mudambi SM, Schuff D (2010) What makes a helpful online review? A study of customer reviews on amazon.com. MIS Quart. 34(1):185-200.
109. Nelson MR, Rademacher MA, Paek H-J (2007) Downshifting consumer D upshifting citizen? An examination of a local Freecycle community. Ann. Amer. Acad. Political Soc. Sci. 611(1): 141-156.
110. Nelson RR, Winter SG (1982) An Evolutionary Theory of Economic Change (Harvard University Press, Cambridge, MA).
111. Nowak M, Highfield R (2011) Super Cooperators: Altruism, Evolution, and Why We Need Each Other to Succeed (Free Press, New York).
112. Nowak MA, Roch S (2007) Upstream reciprocity and the evolution of gratitude. Proc. Roy. Soc. Ser. B 274(1610):605-610.
113. Nowak MA, Sigmund K (1998) Evolution of indirect reciprocity by image scoring. Nature 393(6685):573-577.
114. Olson M (1965) The Logic of Collective Action: Public Goods and the Theory of Groups (Harvard University Press, Cambridge, MA).
115. O'Mahony S, Bechky BA (2008) Boundary organizations: Enabling collaboration among unexpected allies. Admin. Sci. Quart. 53(3):422-459.
116. O'Mahony S, Ferraro F (2007) The emergence of governance in an open source community. Acad. Management J. 50(5): 1079-1106.
117. Ortí L, Carbajo RJ, Pieper U, Eswar N, Maurer SM, Rai AK, Taylor G, et al. (2009) A kernel for open source drug discovery in tropical diseases. PLOS Neglected Tropical Diseases 3(4):e418.
118. Ouchi WG (1980) Markets, bureaucracies, and clans. Admin. Sci. Quart. 25(1):129-141.
119. Page T, Putterman L, Unel B (2005) Voluntary association in public goods experiments: Reciprocity, mimicry and efficiency. Econom. J. 115(506):1032-1053.
120. Partha D, David PA (1994) Toward a new economics of science. Res. Policy 23(5):487-521.
121. Perlroth N (2011) Non-profit couchsurfing raises millions in funding. Forbes (August 24) http://www.forbes.com/sites/nicoleperlroth/2011/08/24/non-profit-couchsurfing-raises-millions-in-funding/.
122. Platt J (1973) Social trap. Amer. Psych. 28:641-651.
123. Popper KR (1959) The Logic of Scientific Discovery (Basic Books, New York).
124. Popper KR (1963) Conjectures and Refutations: The Growth of Scientific Knowledge (Routledge and Kegan Paul, London).
125. Porter CE, Donthu N (2008) Cultivating trust and harvesting value in virtual communities. Management Sci. 54(1):113-128.
126. Prietula MJ (2011) Thoughts on complexity and computational models. Allen P, Maguire S, McKelvey B, eds. The Sage Handbook of Complexity and Management (Sage, Thousand Oaks, CA), 93-110.
127. Prietula MJ, Carley KM, Gasser LG (1998) Simulating Organizations: Computational Models of Institutions and Groups (AAAI Press/MIT Press, Menlo Park, CA).
128. Rai AK (2005) "Open and collaborative" research: A new model for biomedicine. Hahn RW, ed. Intellectual Property Rights in Frontier Industries: Software and Biotechnology (AEI Press, Washington, DC), 131-158.
129. Raub W (1988) Problematic social situations and the "large-number dilemma" a game? Theoretical analysis. J. Math. Sociol. 13(4): 311-357.
130. Raymond ES (1999) The Cathedral and the Bazaar (O'Reilly, Sebastopol, CA).
131. Robins RW, Beer JS (2001) Positive illusions about the self: Shortterm benefits and long-term costs. J. Personality Soc. Psych. 80(2):340-352.
132. Rustagi D, Engel S, Kosfeld M (2010) Conditional cooperation and costly monitoring explain success in forest commons management. Science 330(6006):961-965.
133. Santos FC, Santos MD, Pacheco JM (2008) Social diversity promotes the emergence of cooperation in public goods games. Nature 454(7205):213-217.
134. Schelling T (1978) Micromotives and Macrobehavior (W.W. Norton & Company, New York).
135. Scott SV, Orlikowski WJ (2012) Reconfiguring relations of accountability: Materialization of social media in the travel sector. Accounting, Organ. Soc. 37(1):26-40.
136. Sen AK (1977) Rational fools: A critique of the behavioral foundations of economic theory. Philos. Public Affairs 6(4):317-344.
137. Shah SK (2005) Open beyond software. Cooper D, DiBona C, Stone M, eds. Open Sources 2.0: The Continuing Evolution (O'Reilly, Sebastopol, CA), 339-360.
138. Shah SK (2006) Motivation, governance and the viability of hybrid forms in open source software development. Management Sci. 52(7):1000-1014.
139. Shen C, Monge P (2011) Who connects with whom? A social network analysis of an online open source software community. First Monday 16(6) http://firstmonday.org/ojs/index.php/fm/article/view/3551/2991.
140. Simon HA (1976) From substantive to procedural rationality. Latsis SJ, ed. Method and Appraisal in Economics (Cambridge University Press, Cambridge, UK), 129-148.
141. Strandburg KJ (2009) Norms and the sharing of research materials and tacit knowledge. Dreyfuss RC, First H, Zimmerman DL, eds. Working Within the Boundaries of Intellectual Property (Oxford University Press, New York), 85-110.
142. Sutton RI, Staw BM (1995) What theory is not. Admin. Sci. Quart. 40(3):371-384.
143. Sydow J, Schreyögg G, Koch J (2009) Organizational path dependece: Opening the black box. Acad. Management Rev. 34(4):689-709.
144. Tapscott D, Williams AD (2006) Wikinomics: How Mass Collaboration Changes Everything (Portfolio, New York).
145. Vollan B, Ostrom E (2010) Cooperation and the commons. Science 330(6006):923-924.
146. von Hippel E (2005a) Democratizing Innovation (MIT Press, Cambridge, MA).
147. von Hippel E (2005b) Open source software projects as user innovation networks. Feller J, Fitzgerald B, Hissam SA, Lakhani KR, eds. Perspectives on Free and Open Source Software (MIT Press, Cambridge, MA), 267-78.
148. von Hippel E, von Krogh G (2003) Open source software and the private-collective innovation model: Issues for organization science. Organ. Sci. 14(2):209-223.
149. von Krogh G, von Hippel E (2003) Special issue on open source software development. Res. Policy 32(7):1149-1157.
150. von Krogh G, von Hippel E (2006) The promise of research on open source software. Management Sci. 52(7):975-984.
151. von Krogh G, Späth S, Lakhani KR (2003) Community, joining, and specialization in open source software innovation: A case study. Res. Policy 32(7):1217-1241.
152. Von Neumann J, Morgenstern O (1944) Theory of Games and Economic Behavior (Princeton University Press, Princeton, NJ).
153. Wasko MM, Faraj S (2005) Why should I share? Examining social capital and knowledge contribution in electronic networks of practice. MIS Quart. 29(1):33-57.
154. Weber M (1947) The Theory of Social and Economic Organization (Free Press, New York).
155. Weber S (2004) The Success of Open Source (Harvard University Press, Cambridge, MA).
156. Weber JM, Murnighan JK (2008) Suckers or saviors? Consistent contributors in social dilemmas. J. Personality Soc. Psych. 95(6): 1340-1353.
157. Wegner DM (1986) Transactive memory: A contemporary analysis of the group mind. Mullen B, Goethals GR, eds. Theories of Group Behavior (Springer-Verlag, New York), 185-205.
158. West J (2003) How open is open enough? Melding proprietary and open source platform strategies. Res. Policy 32(7):1259-1285.
159. West J, Gallagher S (2006) Patterns of open innovation in open source software. Chesbrough H, Vanhaverbeke W, West J, eds. Open Innovation: Researching a New Paradigm (Oxford University Press, Oxford, UK), 82-108.
160. Willer R, Flynn FJ, Zak S (2012) Structure, identity, and solidarity: A comparative field study of generalized and direct exchange. Admin. Sci. Quart. 57(1):119-155.
161. Yamagishi T, Kiyonari T (2000) The group as the container of generalized reciprocity. Soc. Psych. Quart. 63(2):116-132.
162. Zeitlyn D (2003) Gift economies in the development of open source software: Anthropological reflections. Res. Policy 32(7): 1287-1291.
163. Zhang XM, Zhu F (2011) Group size and incentives to contribute: A natural experiment at Chinese Wikipedia. Amer. Econom. Rev. 101(4):1601-1615.
164. Zittrain J (2008) The Future of the Internet-And How to Stop It (Yale University Press, New Haven, CT).