^Money in the modern economy is just a special form
of IOU, or in the language of economic accounts, a financial
asset.^
^Money is a social institution that provides a solution to
the problem of a lack of trust.(5) It is useful in exchange
because it is a special kind of IOU: in particular, money in
the modern economy is an IOU that everyone in the
economy trusts. Because everyone trusts in money, they
are happy to accept it in exchange for goods and services —
it can become universally acceptable as the medium of
exchange^
^Since 1931, Bank of England money has been fiat money.
Fiat or ‘paper’ money is money that is not convertible to
any other asset (such as gold or other commodities).^
Because fiat money is accepted by everyone in the economy as the medium of exchange, although the Bank of England is in debt to the holder of its money, that debt can only be repaid in more fiat money. The Bank of England promises to honour its debt by exchanging banknotes, including those no longer in use, for others of the same value forever. For example, even after its withdrawal on 30 April 2014, the £50 note featuring
^Sir John Houblon will still be swapped by the Bank for the
newer £50 note, which features Matthew Boulton and
James Watt.^
Why do people use it?
Fiat money offers advantages over linking money to gold when it comes to managing the economy. With fiat money, changes in the demand for money by the public can be matched by changes in the amount of money available to them. When the amount of money is linked to a commodity, such as gold, this places a limit on how much money there can be, since there is a limit to how much gold can be mined. And that limit is often not appropriate for the smooth functioning of the economy