This study tested a causal relationship between international public relations (PR) expenditure and its economic outcome at the country level by using a time-series analysis. International PR expenditures of four client countries (Japan, Colombia, Belgium, and the Philippines) were collected from the semi-annual reports of the Foreign Agency Registration Act (FARA) from 1996 to 2009. Economic outcome was measured by U.S. imports from the client countries and U.S. foreign direct investment (FDI) toward them. This study found that the past PR expenditure holds power in forecasting future economic outcomes for Japan, Belgium, and the Philippines except Colombia.