Tariffs and international trade
International trade brings other nations markets in and as well grows the competition market with an option that can not be bought out. This is a net good thing for the economy. How ever you get the greedy corporations and exec's get tariff's on trade thrown up to stifle the out of nation market coming in to drive up costs to boost their income. International trade that goes on long enough permanently interlinks 2 or more nations economies resulting in if one fails they all fail. Any tariff in this level of interlinking will cause an economic down turn to all. Tariffs too high results in business's that tapped into the markets of other nations forces those business's to raise costs to consumers, layoff staff, relocate, or just close down.