Expectations are high, but evidence of the impact of microcredit remains in
short supply. This article estimates the impact of an urban credit program
me in Zambia on business performance and on a range of indicators of wellbe
ing, Borrowers who obtained a second loan experienced significantly higher
average growth in business profits and household income. Inflexible group e
nforcement of loan obligations resulted in some borrowers, especially among
st those who had taken only one loan, being made worse off. Our methodologi
cal investigations suggest that the supply of rigorous impact studies can b
e increased by basing them on data collection that sen,es a wider range of
purposes, including market research.