Until President Trump took office for the second time, one of the most-reliable relationships in foreign-exchange markets was between the value of the Canadian dollar and the price of oil. When oil prices rose, so did the Loonie, making Canadians richer as a result. Since oil is priced in US dollars, a stronger Loonie meant Canadians did not get so much Canadian currency in exchange for their oil as they otherwise would have; but they got more of everything else.