High demand for it thus it produced high profit
I think you are looking for totalitarian Dictatroship
Answer:
The Byzantine Empire fell.
Explanation:
Studied it for a long time, hope this helps you as much as intended.
Tariff makes the most sense. Embargo is a ban on goods or a country, subsidy is money granted from the government to a business and has nothing to do with trade, quota is a limited amount of a product and again doesn't really have anything to do with trade.
