Identify the sinusoidal (or sine) waveform in the figure below. 
Definitions:
Changes in P
Variations in price levels over time, which can indicate inflation or deflation within an economy.
Changes in V
Variations in the velocity of money, indicating how fast money is circulating in the economy and affecting inflation and economic activity.
Changes in Q
Refers to variations in quantity, which can apply to different contexts such as quantity demanded or supplied in economics.
Changes in M
Refers to variations in the money supply in an economy, which can influence interest rates, inflation, and economic growth.
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