Taking the exogenous variables At and Kt as given, the equations for labour demand and labour supply together determine a value of Nt. On the demand side, given a value of Nt along with At and Kt, output Yt is determined from the production funtion Yt = AtF (Kt, Nt). B) In the real block of the economy, the IS and Ys curves together determine the equilibrium value of real endogenous variables. C) In the nominal side of the economy, if we graph Mt on the horizontal axis and rt on vertical axis, money demand is a dowmward-sloping curve. D) In the real block of the economy, the IS curve summarizes the combinations of (rt, Yt) where the aggregate resource constraint holds and households and firms behave optimally. E) In the real block of the economy, the Ys curve is the set of (rt, Yt) pairs where the labour demand equation and the labour supply equation hold and the economy is on the production function