Does the lack of peers contribute to the observed gender gap in entrepreneurial success? A random sample of customers of India’s largest women's bank was offered two days of business counseling, and a random subsample was invited to attend with a friend. The intervention significantly increased participants' business activity, but only if they were trained with a friend. Those trained with a friend were more likely to have taken out business loans, were less likely to be housewives, and reported increased business activity and higher household income, with stronger impacts among women subject to social norms that restrict female mobility.
Field, Erica, Seema Jayachandran, Rohini Pande, and Natalia Rigol. "Friendship at Work: Can Peer Effects Catalyze Female Entrepreneurship?" American Economic Journal: Economic Policy 8.2 (May 2016): 125-153.