How are subsidies similar to tariffs?

Both are types of taxes. Both aim to lower the price of domestic goods. Both try to raise the price of imported goods.

They both set limits on imported goods and both aim to disadvantage imports. ... Quotas facilitate the sale of more domestic goods.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.