Canada can only go so far in responding to new import taxes imposed by US President Donald Trump given the mismatch in size between the economies, Prime Minister Mark Carney said.“There is a limit to matching these tariffs dollar for dollar given the fact that our economy is a tenth the size of the United States,

Since U.S. President Donald Trump first threatened to place massive tariffs on Canadian goods, the country has been embroiled in a whirlwind back and forth with its biggest trading partner. Here's a quick look at how tariffs are set under normal circumstances.