Geopolitics.com.gr
Πηγές:
- Lofgren, K. G., et al. (2002). "Markets with asymmetric information: the contributions of George Akerlof, Michael Spence and
Joseph Stiglitz." The Scandinavian Journal of Economics 104(2): 195-211.
- Roberts, M. J. and M. Spence (1976). "Effluent charges and licenses under uncertainty." Journa و X