Why must firms use land, labor, and
other resources efficiently in per-
fectly competitive markets?

Why must firms use land, labor, and other resources efficiently in perfectly competitive markets? Producers cannot control price, so they must use resources as efficiently as possible in order to manage costs to make a "accounting" profit. ... If it's not unique, customers will buy alternative products at lower prices.

Explanation:

answer; /// i do believe that the correct answer is (a); a farming tribe that settled primarily along the mississippi and arkansas rivers;

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.