Large economies can affect world prices by applying import tariffs.
Is this because they definitionally comprise a substantial portion of global consumption, and hence by shifting production domestically they can shift the world price equilibrium?
What is the mechanism of action?
For example, if the USA comprises 25% of auto consumption, if they apply a tariff
t to autos, that will presumably lower the quantity demanded outside of the US as US consumers are incentivised to buy locally.
What effect on global price might this have?