Answer: Encouraging high wages to increase national purchasing power. 
Explanation: Mercantilism is the theory that a nation must always have a positive balance of trade, in the manner that a merchant would operate a shop. Typically this model presupposes protectionism.
 It is aimed at accumulating monetary reserves through a positive balance of trade, especially of finished goods. 
Encouraging high wages to increase national purchasing power is not a good mercantilistic practice because it is not aimed at accumulating monetary reserves through a positive balance of trade.