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How decreasing the prime interest rate helps to offset decreasing oil prices 
You may be missing how countries like Canada may have oil be more of the GDP than countries like the US. In Canada, the lower oil prices may mean more of an economic slowdown with oil companies laying off staff, canceling projects and some companies probably going under as some provinces like Alberta are highly dependent on oil prices to drive most of the economy. In contrast, the US isn't quite as rich in Energy sources and thus may not have the same issues would be my guess. Context matters here. If the rate change helps everybody, doesn't that include the oil producing companies? I'd like to think so using basic logic. What if the main reason for lowering rates was the economic fallout of the decrease in oil prices? Consider that the there would be the question of, "Why do this now?" that has to be answered and the only main change is lower oil prices on a macroeconomic level.