In response to a poll on Modern Monetary Theory, Nobel Laureate Oliver Hart said that Governments financing deficits by printing more money "can quickly lead to inflation or even hyperinflation once the economy is close to full capacity".
What does he mean by the economy being close to full capacity?
Full capacity means utilization of all resources in economy. That is all labor, capital and other resources are already used at their best uses. Economy will not always work at its full potential for various reasons. For example, due to fall in aggregate demand during recession, which can cause unemployment to be above natural rate.
Monetary policy or fiscal policy can stimulate economy but only to the point economy reaches full capacity (i.e. all resources are put to their best uses). After that point as Hart mentions monetary stimulus will likely lead just to inflation or potentially hyperinflation.
