J. Andreoni, Impure Altruism and Donations to Public Goods: A Theory of Warm-Glow Giving, The Economic Journal, vol.100, issue.401, pp.464-77, 1990.
DOI : 10.2307/2234133

D. Arce, Leadership and the aggregation of international collective action, Oxford Economic Papers, vol.53, issue.1, pp.114-151, 2001.
DOI : 10.1093/oep/53.1.114

K. Arrow, Gifts and Exchanges, Philosophy and Public Affairs, vol.1, pp.343-62, 1972.
DOI : 10.1515/9781400853564.139

N. Bardsley and P. G. Moffatt, The Experimetrics of Public Goods: Inferring Motivations from Contributions, Theory and Decision, vol.4, issue.2, pp.161-93, 2007.
DOI : 10.1007/s11238-006-9013-3

R. Bénabou and J. Tirole, Incentives and Prosocial Behavior, American Economic Review, vol.96, issue.5, pp.1652-78, 2006.
DOI : 10.1257/aer.96.5.1652

S. V. Burks, J. Carpenter, L. Götte, K. Monaco, K. Porter et al., Using Behavioral Economic Experiments at a Large Motor Carrier: The Context and Design of the Truckers and Turnover Project, 2007.
DOI : 10.3386/w12976

R. M. Burlando and F. Guala, Heterogeneous Agents in Public Goods Experiments, Experimental Economics, vol.94, issue.1, pp.35-54, 2005.
DOI : 10.1007/s10683-005-0436-4

P. T. Costa and R. R. Mccrae, A Contemplated Revision of the Neo Five-Factor Inventory, Personality and Individual Differences, vol.36, pp.587-96, 2004.

B. Duncan, A theory of impact philanthropy, Journal of Public Economics, vol.88, issue.9-10, pp.2159-80, 2004.
DOI : 10.1016/S0047-2727(03)00037-9

C. C. Eckel and P. J. Grossman, Chapter 57 Differences in the Economic Decisions of Men and Women: Experimental Evidence, Handbook of Experimental Economics Results, pp.509-527, 2008.
DOI : 10.1016/S1574-0722(07)00057-1

U. Fischbacher and S. Gächter, Social Preferences, Beliefs, and the Dynamics of Free Riding in Public Goods Experiments, American Economic Review, vol.100, issue.1, pp.541-556, 2010.
DOI : 10.1257/aer.100.1.541

B. S. Frey and S. Meier, Social Comparisons and Pro-social Behavior: Testing ???Conditional Cooperation??? in a Field Experiment, American Economic Review, vol.94, issue.5, pp.1717-1722, 2004.
DOI : 10.1257/0002828043052187

M. A. Fonseca, S. Huck, and H. T. Normann, Endogenous timing in duopoly: experimental evidence, International Journal of Game Theory, vol.47, issue.3, pp.443-56, 2006.
DOI : 10.1007/s00182-006-0027-4

S. Gächter and E. Renner, Leading by Example in the Presence of Free Rider Incentives, 2005.

S. Gächter and E. Renner, Leaders as Belief Managers for Pro-Social Behavior, 2006.

S. Gächter, D. Nosanzo, E. Renner, and M. Sefton, Sequential vs. simultaneous contributions to public goods: Experimental evidence, Journal of Public Economics, vol.94, issue.7-8, pp.7-8, 2010.
DOI : 10.1016/j.jpubeco.2010.03.002

A. Glazer and K. Konrad, A Signaling Explanation for Charity, American Economic Review, vol.86, pp.1019-1047, 1996.
DOI : 10.1007/978-3-540-79247-5_43

Ö. Gürerk, B. Irlenbusch, and B. Rockenbach, Motivating teammates: The leader???s choice between positive and negative incentives, Journal of Economic Psychology, vol.30, issue.4, pp.591-607, 2009.
DOI : 10.1016/j.joep.2009.04.004

W. Güth, M. V. Levati, M. Sutter, and E. Van-der-heijden, Leading by example with and without exclusion power in voluntary contribution experiments, Journal of Public Economics, vol.91, issue.5-6, pp.5-6, 2007.
DOI : 10.1016/j.jpubeco.2006.10.007

W. Harbaugh, What do donations buy?, Journal of Public Economics, vol.67, issue.2, pp.269-84, 1998.
DOI : 10.1016/S0047-2727(97)00062-5

M. Harris, Voluntary Leaders in Voluntary Welfare Agencies, Social Policy & Administration, vol.5, issue.4, pp.156-167, 2007.
DOI : 10.2307/2094469

B. Hermalin, Toward an Economic Theory of Leadership: Leading by Example, SSRN Electronic Journal, vol.88, pp.1188-206, 1998.
DOI : 10.2139/ssrn.15570

S. Huck, W. Müller, and H. T. Normann, To Commit or Not to Commit: Endogenous Timing in Experimental Duopoly Markets, Games and Economic Behavior, vol.38, issue.2, pp.240-64, 2002.
DOI : 10.1006/game.2001.0889

S. Huck, R. Biel, and P. , Endogenous Leadership in Teams, Journal of Institutional and Theoretical Economics JITE, vol.162, issue.2, pp.253-61, 2006.
DOI : 10.1628/093245606777583495

T. A. Judge, J. E. Bono, R. Ilies, and M. W. Gerhardt, Personality and leadership: A qualitative and quantitative review., Journal of Applied Psychology, vol.87, issue.4, pp.765-80, 2002.
DOI : 10.1037/0021-9010.87.4.765

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

M. Komai, M. Stegeman, and B. E. Hermalin, Leadership and Information, American Economic Review, vol.97, issue.3, pp.944-951, 2007.
DOI : 10.1257/aer.97.3.944

C. Kumru and L. Vesterlund, The Effect of Status on Charitable Giving, Journal of Public Economic Theory, vol.87, issue.4, pp.709-744, 2010.
DOI : 10.1111/j.1467-9779.2010.01471.x

R. Kurzban and D. Houser, Experiments investigating cooperative types in humans: A complement to evolutionary theory and simulations, Proceedings of the National Academy of Sciences, vol.102, issue.5, pp.1803-1810, 2005.
DOI : 10.1073/pnas.0408759102

M. V. Levati, M. Sutter, and E. Van-der-heijden, Leading by Example in a Public Goods Experiment with Heterogeneity and Incomplete Information, Journal of Conflict Resolution, vol.51, issue.5, pp.793-818, 2007.
DOI : 10.1177/0022002707302796

D. Levy, K. Padgitt, S. Peart, D. Houser, and E. Xiao, Leadership, cheap talk and really cheap talk, Journal of Economic Behavior & Organization, vol.77, issue.1, pp.40-52, 2011.
DOI : 10.1016/j.jebo.2010.02.018

J. A. List and D. Lucking-reiley, The Effects of Seed Money and Refunds on Charitable Giving: Experimental Evidence from a University Capital Campaign, Journal of Political Economy, vol.110, issue.1, pp.215-248, 2002.
DOI : 10.1086/324392

A. Mathur, Older adults' motivations for gift giving to charitable organizations: An exchange theory perspective, Psychology and Marketing, vol.25, issue.1, 1996.
DOI : 10.1002/(SICI)1520-6793(199601)13:1<107::AID-MAR6>3.0.CO;2-K

C. Meidinger and M. C. Villeval, Leadership in Teams: Signaling or Reciprocating? GATE Working Paper, pp.10-13, 2003.

E. Moxnes and E. Van-der-heijden, The Effect of Leadership in a Public Bad Experiment, Journal of Conflict Resolution, vol.41, issue.6, pp.773-95, 2003.
DOI : 10.1177/0022002703258962

M. Niederle and L. Vesterlund, Do Women Shy Away From Competition? Do Men Compete Too Much?, The Quarterly Journal of Economics, vol.122, issue.3, pp.1067-1101, 2007.
DOI : 10.1162/qjec.122.3.1067

D. Nosanzo and M. Sefton, Endogenous Move Structure and Voluntary Provision of Public Goods: Theory and Experiment, Journal of Public Economic Theory, vol.87, issue.3-4, pp.721-54, 2011.
DOI : 10.1111/j.1467-9779.2011.01518.x

J. Potters, M. Sefton, and L. Vesterlund, After you???endogenous sequencing in voluntary contribution games, Journal of Public Economics, vol.89, issue.8, pp.1399-419, 2005.
DOI : 10.1016/j.jpubeco.2004.02.008

J. Potters, M. Sefton, and E. Van-der-heijden, Hierarchy and Opportunism in Teams, SSRN Electronic Journal, vol.69, issue.1, pp.39-50, 2009.
DOI : 10.2139/ssrn.814645

M. F. Rivas and M. Sutter, The benefits of voluntary leadership in experimental public goods games, Economics Letters, vol.112, issue.2, pp.176-184, 2011.
DOI : 10.1016/j.econlet.2011.04.007

J. Shang and R. Croson, The impact of social comparisons on non-profit fundraising, Research in Experimental Economics, vol.11, issue.3, pp.221-233, 2008.

R. Sugden, Reciprocity: The Supply of Public Goods Through Voluntary Contributions, The Economic Journal, vol.94, issue.376, pp.772-87, 1984.
DOI : 10.2307/2232294

H. R. Varian, Sequential contributions to public goods, Journal of Public Economics, vol.53, issue.2, pp.165-86, 1994.
DOI : 10.1016/0047-2727(94)90019-1

L. Vesterlund, The informational value of sequential fundraising, Journal of Public Economics, vol.87, issue.3-4, pp.627-657, 2003.
DOI : 10.1016/S0047-2727(01)00187-6

P. G. Warr, Pareto optimal redistribution and private charity, Journal of Public Economics, vol.19, issue.1, pp.131-169, 1982.
DOI : 10.1016/0047-2727(82)90056-1

J. M. Wooldridge, Cluster-Sample Methods in Applied Econometrics, American Economic Review, vol.93, issue.2, pp.133-138, 2003.
DOI : 10.1257/000282803321946930

R. Zeiliger, A Presentation of Regate, Internet Based Software for Experimental Economics, RegateIntro.ppt., GATE, vol.136, issue.118122, p.145231317, 2000.