The objectives were to assess the performance of social marketing interventions under the manufacturer's model, a model that has the potential to achieve sustainability (defined as continuing contraceptive availability after the withdrawal of donor support), in four middle-income countries. Fifteen rounds of data from nationally representative surveys implemented in Morocco, the Dominican Republic, Peru, and Turkey between 1986 and 2003 are analyzed to determine changes in the commercial sector's share of oral contraceptives and condoms before and after the withdrawal of donor support. Attention is paid to changes in lower- and middle-income groups. Wealth quintiles are used as a proxy for economic status. Retail sales data on oral contraceptives (OCs) from 1994 to 2004 were available in Morocco and the Dominican Republic and are examined to determine sales volumes and prices of social marketing and other commercial brands.