e economists, which of the following is NOT a reason that surpluses in welfare analysis may not properly measure costs and benefits of trade barriers?...

According to some economists, which of the following is NOT a reason that surpluses in welfare analysis may not properly measure costs and benefits of trade barriers?a. Labor used in a sector would otherwise be unemployed.b. Defects exist in the labor market that prevent resources from transferring between sectors efficiently.c. Technological spillovers occur from innovative industries.d. Terms of trade are intellectually impeccable for reasonable analysis.