Why Prices Keep Rising

Inflation is not simply companies charging more; it is the ratio of money chasing goods. When the total money stock rises faster than the total real output, average prices must rise, and only monetary expansion can make that rise persist.

The money mechanism

A simplified way to see it: multiply the money supply by how often each unit is spent, which economists call velocity. That gives total spending. Divide by total output to get the average price level. If the money supply grows but output does not, the price level goes up. Central banks change the money supply mostly by buying financial assets, which adds reserves to banks, and those reserves become new loans and deposits. Businesses raise prices persistently only when their costs, wages, materials, energy, keep rising, and those costs rise because total demand is growing faster than supply.

Worked example: imagine a small island with $100 circulating and 20 loaves of bread baked each year. Each loaf sells for $5. Next year the central bank injects $20, so $120 is available. If bakers still produce only 20 loaves, the price per loaf rises to $6. That is a 20 percent inflation. But if the harvest doubles to 40 loaves, then $120 divided by 40 loaves equals $3, so prices fall even though more money exists. This is why inflation is always a race between money and output.

The common misunderstanding

People point to a specific price jump, like a company raising laptop prices, and call it inflation. That is often a relative price change, not inflation. A flood in a major shipping lane disrupts supply; the price of some goods rises. If no extra money exists, spending on those goods leaves less for other goods, so other prices should fall. In practice, prices are sticky downwards, and the initial shock can feed into wage demands and expectations. Then the central bank faces a choice: hold money constant and accept a recession, or expand money and validate a higher price level. Either way, the cause of sustained rising prices is monetary accommodation, not the original shock.

It is also wrong to say the model applies everywhere at all times. During a deep recession, money supply growth can be high but prices stay flat or fall because people are paying down debt and not spending; velocity collapses. Likewise, a single firm with market power can raise prices and squeeze margins without inflation, as long as other prices fall or output adjusts. The quantity story explains the general price level, not each transaction.

When does it not apply? Administered prices, price controls, subsidies, and monopolies can all push specific prices up or keep them down independent of money and supply. But those are exceptions; the broad trend in the price level over the long run follows the money-supply growth relative to the economy's real capacity.