David Hume's Price-Specie-Flow Mechanism

David Hume's price-specie-flow mechanism

A) reinforced the Mercantilist notion that a country could maintain a permanent "favorable" balance of trade where exports exceeded imports.
B) works more effectively if demands for traded goods are "price-elastic" rather than "price-inelastic."
C) assumed that the countries involved have substantial unemployment.
D) works equally effectively whether demands for traded goods are "price-elastic" or "price-inelastic."