Bandyopadhyay, Subhayu (contributor); … - 2005 - rev.
-country differences in trade policy, usually by including dummy
variables to indicate membership in preferential trading areas. For our … variables, equation (1) includes a time dummy that controls
for changes in the trade policy of country j, including its levels … gravity model that controls for changes in trade policy, the sizes of the trading partners,
distance, and contiguity, but not …