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If the Economy was like a Car

If I were to use an analogy to demonstrate the effects of monetary policy and fiscal policy on the economy I would first say the economy is much like a car and GDP is much like the speed at which the car is driving at. The key assumptions are that the car is driving on an infinitely straight highway and it is equipped with 2 accelerator peddles each with its own gearbox. Why 2 accelerator peddles?

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