Prices of generic drugs drop more when the number of manufacturers grows.
1 drugmaker
-6%
2 drugmakers
-48%
3 drugmakers
-56%
4 drugmakers
-61%
5 drugmakers
-67%
6 drugmakers
-74%
7 drugmakers
-77%
8 drugmakers
-79%
9 drugmakers
-80%
Findings derived from FDA analysis of retail sales data for single-ingredient brand name and generic drug products sold in the U.S. from 1999 through 2004.
