MV = PY equation
Image: US Federal Reserve, Public domain, via Wikimedia Commons
Quantity theory of money
MV = PY equation
The quantity theory of money (QTM) posits a direct relationship between the money supply (M) and the price level (P), assuming velocity (V) and real output (Y) are constant. This theory suggests that an increase in the money supply leads to proportional inflation, as more money chases the same amount of goods and services.
The equation MV = PY encapsulates this relationship, where M represents the money supply, V is the velocity of money (how fast money circulates), P is the price level, and Y is the real output. This equation serves as a foundational concept in monetary economics, illustrating how changes in one variable can affect others.
Example
If the money supply (M) doubles while velocity (V) and real output (Y) remain constant, the price level (P) would also double, indicating inflation.
Understanding the MV = PY equation is crucial for economists and policymakers to predict inflationary trends and design effective monetary policies.
Related concepts
Supply and demand
Market-clearing price where quantity supplied equals quantity demanded
Efficient-market hypothesis
Prices reflect all available information
Permanent income hypothesis
Permanent income hypothesis (PIH) focuses on permanent income for consumption decisions
Money supply
Money supply influences inflation
Labor theory of value
Value = Labor required for production
Fama–French three-factor model
Fama-French model adds size and value factors to CAPM
Educational content, not financial advice.
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