More than 97% of all the money in the economy exists as bank deposits – and banks create these deposits simply by making loans. Every time someone takes out a loan, new money is created. The Bank of England released a report explaining how this process works: Back in the 1930s, Henry Ford is supposed to have remarked that it was a good thing that most Americans didn't know how banking really works, because if they did, "there'd be a revolution before tomorrow morning".
Last year, something remarkable happened. The Bank of England let the cat out of the bag. In a paper called "Money Creation in the Modern Economy", co-authored by three economists from the Bank's Monetary Analysis Directorate, they stated outright that most common assumptions of how banking works are simply wrong, and that the kind of populist, heterodox positions more ordinarily associated with groups such as Occupy Wall Street are correct. In doing so, they have effectively thrown the entire theoretical basis for austerity out of the window.
To get a sense of how radical the Bank's new position is, consider the conventional view, which continues to be the basis of all respectable debate on public policy. People put their money in banks. Banks then lend that money out at interest – either to consumers, or to entrepreneurs willing to invest it in some profitable enterprise. True, the fractional reserve system does allow banks to lend out considerably more than they hold in reserve, and true, if savings don't suffice, private banks can seek to borrow more from the central bank.
The central bank can print as much money as it wishes. But it is also careful not to print too much. In fact, we are often told this is why independent central banks exist in the first place. If governments could print money themselves, they would surely put out too much of it, and the resulting inflation would throw the economy into chaos. Institutions such as the Bank of England or US Federal Reserve were created to carefully regulate the money supply to prevent inflation. This is why they are forbidden to directly fund the government, say, by buying treasury bonds, but instead fund private economic activity that the government merely taxes.
It's this understanding that allows us to continue to talk about money as if it were a limited resource like bauxite or petroleum, to say "there's just not enough money" to fund social programmes, to speak of the immorality of government debt or of public spending "crowding out" the private sector. What the Bank of England admitted this week is that none of this is really true. To quote from its own initial summary: "Rather than banks receiving deposits when households save and then lending them out, bank lending creates deposits" … "In normal times, the central bank does not fix the amount of money in circulation, nor is central bank money 'multiplied up' into more loans and deposits."