Set out the IS - RX and \(P C-M R\) diagrams for bloc \(A\) and bloc \(B\) (as per Fig. 11.16) and the associated impulse response functions (as per Fig. 11.17) for the case where there is a positive demand shock in bloc \(A\) and a negative demand shock in bloc \(B\) (assume the shocks are equal and opposite and take place simultaneously).