What happens when a permanent gap is created between the real interest rate and the marginal productivity of capital? The example of the euro zone
In the euro zone, the real long-term interest rate is now much lower than the marginal productivity of capital , whereas these two variables should be equal in the long term . This could be explained by expansionary monetary policy, excess savings or high risk aversion. So what are the possible adjustments? A sharp increase in investment and capital accumulation that pushes down the marginal productivity of capital; Bond sales by investors, who switch to other asset classes, which drives up the real long-term interest rate. But it is not possible for a divergence between the real long-term interest rate and the marginal productivity of capital to persist in the long term.