Over time, the average consumer will be better off from reduced trade barriers by
a. greater variety and lower prices
b. less variety and higher prices
c. greater productivity and higher wages

a. greater variety and lower prices

Explanation:

Due to the comparative advantages, countries can produce the product that they have proficiency. For example, if there are 2 countries, A and B. A have a  skill of producing tasty wine, they can produce better quality of wine than B with the lower cost. When the trade barriers are reduced, the wine from A will be sold in B, the customer will have more choices of wine in the market and the price will relatively less different comparing to the price when the high barriers exist.

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