Modern monetary theory (MMT)

Modern Monetary theory, or MMT, has become popular on the left, both in the UK and abroad. (Wags say that it stands for "magic money tree".) 

Modern monetary theory (MMT) is an economic theory whose key implication is that governments should fund public spending by creating as much money as they need.

Hence advocates of MMT argue that treating a currency issuer like a currency user is too restrictive and forces a government to limit spending on services or investment to what it thinks it can afford, rather than what is needed to ensure full employment and the long-term health of the economy. Governments should base their decisions on what is required, and issue enough currency to pay for it.

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The most common objection to MMT is that governments that create their own money without restraint to fund their spending have tended to end up fuelling runaway inflation. Examples include Weimar Germany in 1921-1923 and, more recently, Venezuela and Zimbabwe. MMT supporters claim that spending decisions can take inflation into account, and taxes can be used to mop up excess money supply.

After the global financial crisis and again during the Covid crisis, central banks have funded governments by directly buying new bonds. To a large extent, this is MMT by the back door. We can expect more of this in future, so that we should eventually find out which view is right.

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