Money Neutrality
What is Money Neutrality?
Money neutrality is the idea that changes in the money supply affect only nominal variables (prices, wages) in the long run, leaving real GDP and employment unchanged.
In the long run, a one-time increase in the money supply raises the price level proportionally but leaves real output, employment, and the real interest rate unchanged, money is a 'veil' over the real economy. This follows from the quantity theory (MV = PQ with V and Q fixed in the long run) and underpins the vertical LRAS. Most economists accept long-run neutrality but reject short-run neutrality, since sticky prices and wages let monetary changes affect real output temporarily. The related idea of superneutrality holds that even the growth rate of money does not affect real variables.
Money Neutrality: a worked example
Start from the quantity equation MV = PQ. Suppose M = $80 billion, velocity V = 5, and real output Q = 200 billion units. Then P = MV/Q = (80 × 5)/200 = 2, so a unit of output costs $2. The central bank permanently doubles the money supply to $160 billion. In the long run velocity stays at 5 and output returns to its full-employment level of 200 billion units, so P = (160 × 5)/200 = 4. The price level doubled. Nominal GDP = P × Q rose from 2 × 200 = $400 billion to 4 × 200 = $800 billion, doubling as well, while real GDP never moved off 200 billion units. A household holding $60 in cash could buy 60/2 = 30 units of goods before and 60/4 = 15 units after, so purchasing power fell exactly in proportion to prices.
The mistake students make with money neutrality
The frequent error is reading neutrality as proof that monetary policy never works, so a student writes that a rate cut during a recession leaves real GDP unchanged. The vertical LRAS is drilled so hard that it gets applied to every time horizon. Neutrality is a long-run statement. In the short run, wages and many prices are sticky, SRAS slopes upward, and more money raises both real output and the price level. Label the horizon explicitly, then pick the curve that matches it.
Money Neutrality questions
Does money neutrality mean inflation is harmless?
Neutrality is a narrow claim about real GDP, employment, and the real interest rate returning to where they started, not a claim that inflation costs nothing. Inflation that arrives unexpectedly still transfers purchasing power from lenders to borrowers on every contract written at a fixed nominal rate, and it erodes the real value of savings held as cash. Uncertainty about future prices makes long-term contracts harder to write. Long-run neutrality and costly inflation sit together comfortably, which is why a central bank can accept that money cannot raise output permanently and still work to keep inflation low.
What is the difference between neutrality and superneutrality?
Neutrality says a one-time change in the level of the money supply changes only nominal variables in the long run. Superneutrality goes further and says the growth rate of money leaves real variables alone too, so an economy with money growing 2% a year and one with money growing 8% a year would have the same real GDP and the same real interest rate, differing only in their inflation rates. Superneutrality is the stronger and more contested claim, since a permanently faster growth rate changes the tax on holding money and can alter saving and investment decisions.
Why does money neutrality imply a vertical LRAS?
Long-run aggregate supply stands vertical precisely because output over the long haul depends on resources, technology, and institutions rather than on the price level or the money stock. If doubling the money supply doubles every price and wage proportionally, no producer faces a better relative price and no worker faces a different real wage, so nothing changes production decisions. Quantity supplied in the long run stays at potential output for every price level, which is what a vertical line at full-employment GDP draws.
Formula / Example
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