A distinguishing feature of small firms is that most small business ow
ners work for themselves and only employ relatives and friends. We exa
mine conditions under which this labor market practice is an economic
outcome and consider the link between this outcome and unemployment. T
he model is motivated by empirical evidence that suggests that small f
irms are subject to financial constraints that are supported by inform
ation asymmetries. I show that, in a constrained equilibrium, sole pro
prietorship and unemployment arise from an information imperfection in
the credit market that makes infeasible the consummation of mutually
beneficial contracts in the labor market.