"When we succeed in finding a definite causal relation between two phenomena, our problem is solved if the one which plays the ‘causal’ role is non-economic.”(Schumpeter[1], 1934, p4-5).
Ofcourse "social behavior" is a non-economic phenomena.
[1] Schumpeter, Joseph A. 1934. The Theory of Economic Development. Edited by Redvers Opie. Fifth prin. Cambridge, Massachusetts: Harvard University Press.