A structural model of entry and fiscal policy is presented. It shows that taxation of variable production costs can increase product prices, lower competition, and reduce the availability of new products in small markets. The model’s test is based on a unique nationwide fiscal experiment. We study the effects of the 1869 stamped paper tax reform act on the market for daily newspapers in the Netherlands. The econometric analysis uses data on when and where the newspapers existed and were introduced together with demographic census data from 1859 and 1869. The results confirm the model’s predictions and show how taxation affects strategic business location decisions.