The tariffs, sanctions, and quotas all have limiting roles in the global economy. They are all methods through which the trade is limited, or even stopped, be it for only some goods, or for all. There's numerous examples around the world for their usage, and the purposes vary from protection of the domestic companies, to punishing some country for its actions. We can take the increase of the tariffs of the USA toward China's goods as an example, China's quotas on the foreign movies because of the social influence, or the sanctions toward North Korea because of its politics.