I develop a model of firm-to-firm search and matching to show that the impact of falling trade costs on firm sourcing decisions and consumer welfare depends on the relative size of search externalities in domestic and international markets. These externalities can be positive if firms share information about potential matches, or negative if the market is congested. Using unique firm-to-firm transaction-level data from Uganda, I document empirical evidence consistent with positive externalities in international markets and negative externalities in domestic markets. I then build a dynamic quantitative version of the model and show that, in Uganda, a 25% reduction in trade costs led to a 3.7% increase in consumer welfare, 12% of which was due to search externalities.
This paper investigates the global macroeconomic consequences of falling oil prices due to the oil
revolution in the United States, using a Global VAR model estimated for 38 countries/regions
over the period 1979Q2 to 2011Q2. Set-identification of the U.S. oil supply shock is achieved
through imposing dynamic sign restrictions on the impulse responses of the model. The results
show that there are considerable heterogeneities in the responses of different countries to a U.S.
supply-driven oil price shock, with real GDP increasing in both advanced and emerging market
oil-importing economies, output declining in commodity exporters, inflation falling in most
countries, and equity prices rising worldwide. Overall, our results suggest that following the U.S.
oil revolution, with oil prices falling by 51 percent in the first year, global growth increases by
0.16 to 0.37 percentage points. This is mainly due to an increase in spending by oil importing
countries, which exceeds the decline in expenditure by oil exporters.