Milk and cheese are much cheaper in the US because Canadians are served via. controlled 'supply management' and 'marketing boards' that help to maintain a 'fair' price for mom 'n pop Canadian dairy producers. AKA mega agri-corporations.

Which explains why poor Canacks are continuously lined up at the borders in their mini-vans loaded to the roof with groceries, clothing and gasoline.

Similar 'arrangements' are in place in Canada for the telecom sector, banking, much of food production auto sales, etc. On a whole, Canadians pay on average 25% more than Americans for a broad basket of goods and services. Plus wages are lower on average and taxes are higher.

But higher dairy and gasoline prices are 'good' for you!