If factors of production are mobile between industries, the Stolper-Samuelson Theorem predicts that cleavages over trade policy will form along factor lines. Conversely, if factors are immobile, cleavages will form along industry lines. These two hypotheses are empirically examined using...

This paper uses campaign contribution data to examine trade policy preferences among political action committees. With perfect factor mobility, as the Heckscher-Ohlin (HO) model assumes, interest group trade positions should depend on their factor of production but not on their industry. We...