Many studies use tariffs to measure changes in trade policy. This paper shows that standard sources for tariffs suffer … from substantial measurement error due to misreporting and the resulting false imputation: Countries fail to report tariffs … every year and missing data are more prevalent for preferential than for most favored nation (MFN) tariffs. WITS, the main …

bilateral measure of market access to compare tariffs applied in 1996 and 2006, which includes the timing of the Uruguay Round … and episodes of bilateral liberalization. Our econometric estimations show that the reduced tariffs imposed on emerging …