I samme åndedrag, her er en OLG som gir NB mer OMG. (2/2)

Hvor var jeg?

Men, i andre rammeverk med enkle løsninger på komplekse problemer kan vi argumentere for mindre finanspolitikk og mer pengepolitikk i respons til sjokk.

Vi skal til An Exploration of Optimal Stabilization Policy
av N. G. Mankiw og M. Weinzierl ved Harvard. Fra konklusjonen:

The first level of the hierarchy applies when the zero lower bound on the short-term interest rate is not binding. In this case, conventional monetary policy is sufficient to restore the economy to full employment. That is, all that is needed is for the central bank to cut the short-term interest rate. Fiscal policy should be set based on classical principles of cost-benefit analysis, rather than Keynesian principles of demand management. Government consumption should be set to equate its marginal utility with the marginal utility of private consumption. Government investment should be set to equate its marginal product with the marginal product of private investment.

The second level of the hierarchy applies when the short-term interest rate hits against the zero lower bound. In this case, unconventional monetary policy becomes the next policy instrument to be used to restore full employment. A reduction in long-term interest rates may be sufficient when a cut in the short-term interest rate is not. And an increase in the long-term nominal anchor is, in this model, always sufficient to put the economy back on track. This policy might be interpreted, for example, as the central bank targeting a higher level of nominal GDP growth. With this monetary policy in place, fiscal policy remains classically determined.

The third level of the hierarchy is reached when monetary policy is severely constrained. In particular, the short-term interest rate has hit the zero bound, and the central bank is unable to commit to future monetary policy actions. In this case, fiscal policy may play a role. The model, however, does not point toward conventional fiscal policy, such as cuts in taxes and increases in government spending, to prop up aggregate demand. Rather, fiscal policy should aim at incentivizing interest-sensitive components of spending, such as investment. In essence, optimal fiscal policy tries to do what monetary policy would if it could.

The fourth and final level of the hierarchy is reached when monetary policy is severely constrained and fiscal policymakers can rely on only a limited set of fiscal tools. If targeted tax policy is for some reason unavailable, then policymakers may want to expand aggregate demand by increasing government spending, as well as cutting the overall level of taxation to encourage consumption. In a sense, conventional fiscal policy is the demand management tool of last resort.

På hvilket nivå tror du vi/EU/USA/Japan er nå? Les hele her. (pdf)

(For dere modellerere der ute se kommentarene til Blanchard og Eggertsson.)

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