In April 1990, the prices of five brands of contraceptives in the Bang
ladesh social marketing project were increased, by an average of 60%.
The impact on condom sales was immediate and severe, with sales for th
e following 12 months dropping by 46% from the average during the prec
eding 12 months. The effect on oral contraceptive sales was less drama
tic: average sales in the year following the increases dropped slightl
y despite a previously established pattern of rapidly rising sales. Th
ere appears no reasonable combination of events other than the price i
ncrease itself to explain most of the difference.