The typical Keynesian model with sticky price consists of the following two equations:

The typical Keynesian model with sticky price consists of the following two equations: Good market condition: Y = C(Y,r) + I(r) + G, Money market condition: - = L(Y, r). These two equations end up having a 2 by 2 matrix that delivers the result as follows: dy = (Cr + Ir)= =dM and dr = (1 - Cy) = =dM. Derive the above result and briefly explain whether the monetary policy is effective in this sticky-price Keynesian model