The Feder's (1982) Model and Findings Suggest All of the Following

The Feder's (1982) model and findings suggest all of the following reasons for why trade has a positive impact on growth except:

A) the export sector of the economy is more productive than the non-export sector.
B) trade generates externalities that increase growth in other parts of the economy.
C) the import sector provides a significant source of technology transfers to the rest of the economy.