Why do countries use tariffs and import quotas

Both tariffs and import quotas reduce quantity of imports, raise domestic price of good, decrease welfare of domestic consumers, increase welfare of do- mestic producers and cause deadweight loss. Tariff raises revenue for the government, import quota may not. ... Total profit equals profit per unit times quantity sold.

Explanation:

the labor movement in the united states grew out of the need to protect the common interest of workers

for those in the industrial sector organized labor unions fought for better wages reasonable hours and safer working conditions

  in the 19th century trade unionism was mainly a movement of skilled workers.

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they remained in rural areas and worked at jobs such as lumbering or farming.