The purpose of this paper is to develop a testable theorythe interaction thesiscapable of explaining why there are differences in economic stability and growth rates between various countries; or, stated negatively, why less efficient countries do not duplicate the economic policies of more successful ones. The interaction thesis identifies the interplay of formal and informal rules as a principal factor affecting economic stability and growth rates. Furthermore, the thesis also sheds light on how the method of choosing formal rules is a major circumstance upon which the interplay of formal and informal rules depends.
Svetozar Pejovich, "The Effects of the Interaction of Formal and Informal Institutions on Social Stability and Economic Development," Journal of Markets & Morality 2, no. 2 (Fall 1999): 164-181