"As production comes to depend more on intangible productive assets, the location of production by multinational firms becomes increasingly ambiguous. The reason is that, within the firm, these assets have no clear geographical location, but only a nominal location determined by the firm's tax...

"We use firm-level data for U.S. multinational enterprises (MNE) and the model of firm heterogeneity first presented in Helpman, Melitz, and Yeaple (2004) to make four empirical contributions. First, we show that the most productive U.S. firms invest in a larger number of foreign countries and...