A Brief History of Money: From Barter to Commodity to Fiat

Barter System

The barter system involves the direct exchange of goods or services without the use of money.

• Double coincidence of wants: Both parties must want what the other offers, making transactions time-consuming and inefficient.

• Example: A farmer wants shoes and must find a shoemaker who wants wheat.

Commodity Money

Commodity money uses items with intrinsic value (such as gold) as a medium of exchange.

• Intrinsic value: The commodity itself has value outside its use as money.

• Difficulty: Controlling the supply and portability of commodity money can be challenging.

• Example: Gold coins used in trade.

Fiat Money

Fiat money is currency authorized by a central bank, not backed by a physical commodity.

• Expectation-based value: Households and firms trust the currency's value due to government backing.

• Example: Modern paper currency such as the US dollar.

The Functions of Money

Medium of Exchange

Money is accepted by buyers and sellers as payment for goods and services.

• Legal tender: Money must be accepted for transactions within an economy.

Unit of Account

Money provides a standard measure for valuing goods and services.

• Advantage: Standardized money increases efficiency by allowing easy price comparisons.

• Example: Pricing goods in dollars rather than bartering.

Store of Value

Money can be saved and used for future purchases.

• Example: Saving cash for future expenses.

Standard of Deferred Payment

Money facilitates borrowing and lending by serving as a means to settle debts in the future.

• Disadvantage: Money may lose purchasing power over time due to inflation.

• Advantage: Money is easily converted into a liquid medium for payment.

Money Supply and Banking

Money as a Stock

Money supply refers to the total value of currency and deposits in circulation.

• Example: Cash and checking account balances.

Bank Money Creation

Banks create money by loaning out reserves in excess of required reserves.

• Required reserves: The legally mandated minimum reserves a bank must hold, based on its deposits.

The Simple Deposit Multiplier

The deposit multiplier shows how much the money supply can increase based on new deposits.

• Formula:

• Total change in checking account deposits:

• Overall change in money supply: Increase in deposits minus decline in currency.

• Real-world multiplier: Usually lower than the simple deposit multiplier due to currency leakage and other factors.

Inflation and the Quantity Theory of Money

Long-Run Implications

The quantity theory of money explains the relationship between money supply growth and inflation.

• Equation:

• Velocity of money (V): The average number of times each dollar is used in a purchase.

• Assuming constant velocity: In the long run, inflation rate equals the growth rate of money minus the growth rate of real GDP.

• Implication: Inflation occurs when money supply grows faster than real GDP.

Short-Run Implications: The Phillips Curve

The Phillips curve illustrates the short-run trade-off between inflation and unemployment.

• Ceteris paribus: The short-run Phillips curve shows a negative relationship between inflation and unemployment.

• Policy movements: Changes in monetary or fiscal policy can shift the curve.

• Expansionary policies: Lower unemployment but higher inflation (leftward movement).

• Contractionary policies: Lower inflation but higher unemployment (rightward movement).