$*18.$ The vertical long$-$run aggregate supply curve satisfies the classical dichotomy because the natural rate of output does not depend on: $\text{'}$a$.$ the labor supply.b$.$ the supply of capital.c$.$ the money supply.$\text{'}$d$.$ technology.$*19.$ Changes in monetary policy shift the:$$a$.$ LM curve.$\text{'}$b$.$ planned spending curve.c$.$ money demand curve.$\text{'}$d$.$ IS curve.$*20.$ The endogenous growth model's assumption of constant returns to capital is more plausible if capital is de fined to include:$\text{'}$ a$.$ plant and equipment.v $$b$.$ knowledge.c$.$ depreciation.Ad$.$ technology.