We study the effects of ability and liquidity constraints on entrepreneurship. We develop a three sector Roy model that … on entry into entrepreneurship. The model predicts--and the data confirm--that entrepreneurs are positively selected on … positively selected on collateral, but other self-employed are not; and entrepreneurship is procyclical, but self-employment is …

Entrepreneurship requires energy and creativity as well as business acumen. Some factors that contribute to … entrepreneurship may decline with age, but business skills increase with experience in high level positions. Having too many older … workers in society slows entrepreneurship. Older workers do not possess the advantages of youth, but more significant is that …