Monetary Economics: Classical, Keynesian, and Modern Theories

Comprehensive vocabulary flashcards covering major monetary theories from classical to modern schools of thought, including mathematical models and key economic effects.

Fisher's Equation of Exchange

The formal articulation of the quantity theory of money expressed as $MV = PT$ or $MV = Py$, where $M$ is money stock, $V$ is velocity, $P$ is price level, $T$ is transactions, and $y$ is real income.

Classical Dichotomy

The theoretical separation of nominal and real variables, positing that real forces determine relative prices and output ($y$), while monetary factors determine the absolute price level ($P$).

Neutrality of Money

The classical doctrine stating that changes in the money supply affect only nominal variables—such as price level and nominal incomes—and have no impact on real variables like real GDP or resource allocation.

Velocity of Money

The ratio of nominal GDP ($Py$) to the stock of money ($M$), defined by the formula $V = \frac{Py}{M}$, representing how many times a unit of currency is spent in a given period.

Money as a Veil

A classical concept suggesting that money serves merely as a medium of exchange that covers or hides real goods and services without affecting output or employment.

Cambridge Cash Balance Approach

A theory relating money stock to total expenditures through the demand for money, expressed by the equation $M = kPy$, where $k$ is the reciprocal of velocity ($V$).

Keynes Effect

The indirect link between money and output through interest rates, symbolically represented as $M \rightarrow r/i \rightarrow I \rightarrow Y$, where increased money supply lowers interest rates and stimulates investment and output.

Liquidity Trap

A Keynesian limiting case where an increase in money supply fails to lower interest rates, rendering monetary policy ineffective in influencing output.

Interest Inelastic Investment

A condition where investment spending is unresponsive to changes in the interest rate, creating a vertical or steep IS curve and limiting the effectiveness of monetary policy.

Pigou Effect (Wealth Effect)

A neoclassical theory positing that a fall in prices increases the real wealth of individuals, which boosts consumption expenditure and ensures the economy returns to full employment.

Crowding Out Effect

A monetarist argument where expansionary fiscal policy raises interest rates, leading to a reduction in private sector investment ($I$) and preventing a rise in total output ($Y$).

Money Illusion

A term coined by Irving Fisher referring to the tendency of economic agents to think of money in nominal terms rather than real terms, leading them to respond to money supply changes in the short run.

Rational Expectations Hypothesis (REH)

A theory developed by Muth, Lucas, Barro, and Sargent suggesting that systematic monetary policy has no impact on real output because rational people use all available information to forecast the price level accurately.

Time Inconsistency Problem

A debate associated with Kydland and Prescott (1977) describing how a policy planned to be optimal for a future time may no longer be optimal when that time arrives, often providing incentives for policy makers to renege on commitments.

Real Business Cycle (RBC) Theory

A post-1980 theory arguing that short-run output fluctuations are driven by real supply-side shocks (technology, labor productivity, natural resources) rather than monetary shocks.

Fisher Effect

The relationship between expected inflation ($\pi^e$) and interest rates, defined by the equation $i = r + \pi^e$, where $i$ is the nominal interest rate and $r$ is the real interest rate.

Monetary Approach to Balance of Payments

A framework where the balance of payments ($BP$) is determined by the difference between money demand ($M_d$) and domestic credit ($DC$), expressed as $BP = M_d - DC$.

Mundell-Fleming Model

A model used to analyze monetary policy in open economies, concluding that monetary policy is ineffective under fixed exchange rates and perfect capital mobility, but effective under flexible exchange rates.

Stagflation

A global economic event characterized by simultaneous high inflation and high unemployment, occurring specifically in the 1970s and early 1980s.

Central Bank Independence

An institutional arrangement designed to avoid government pressure to exploit the Phillips curve trade-off, prioritizing long-term price stability over short-term political goals.