How important is financial development for economic development? A costly state verification model of financial intermediation is presented to address this question. The model is calibrated to match facts about the U.S. economy, such as the intermediation spreads and the firm-size distributions for 1974 and 2004. It is then used to study the international data using cross-country interest-rate spreads and per-capita GDPs. The analysis suggests a country like Uganda could increase its output by 116 percent if it could adopt the world’s best practice in the financial sector. Still, this amounts to only 29 percent of the gap between Uganda’s potential and actual output.