Market concentration of new antibiotic sales.

We calculate the average sales of new antibiotics during their first 8 years on the market. The discounted net present value is only $240 m in total per antibiotic, well below costs of supplying these products. The reliance on the US for sales is striking: the US market accounts for 84% of sales during the first 8 years. These facts clarify the need for additional revenues, especially from other countries, to support incentives for the development of new antibiotics. Market entry rewards may be of particular value.