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The terms cost-push inflation and demand-pull inflation are associated with Keynesian Economics. Without going into a primer on Keynesian Economics (a good one can be found at Econlib) we can still understand the difference between two terms.
- The supply of money goes up.
- The supply of goods goes down.
- Demand for money goes down.
- Demand for goods goes up.
Definition of Cost-Push InflationThe text "Economics" (2nd Edition) by Parkin and Bade gives the following explanation for cost-push inflation:
"Inflation can result from a decrease in aggregate supply. The two main sources of decrease in aggregate supply are
- An increase in wage rates
- An increase in the prices of raw materials
Other things remaining the same, the higher the cost of production, the smaller is the amount produced. At a given price level, rising wage rates or rising prices of raw materials such as oil lead firms to decrease the quantity of labor employed and to cut production." (pg. 865)
Aggregate supply is the "the total value of the goods and services produced in a country" or simply factor 2, "The supply of goods". The supply of goods can be influenced by factors other than an increase in the price of inputs (say a natural disaster), so not all factor 2 inflation is cost-push inflation.
Of course, the next question would be "What caused the price of inputs to rise?". Any combinations of the four factors could cause that, but the two most likely are factor 2 (Raw materials such as oil have become more scarce), or factor 4 (The demand for raw materials and labor have risen).
Definition of Demand-Pull InflationParkin and Bade give the following explanation for demand-pull inflation:
"The inflation resulting from an increase in aggregate demand is called demand-pull inflation. Such an inflation may arise from any individual factor that increases aggregate demand, but the main ones that generate ongoing increases in aggregate demand are
- Increases in the money supply
- Increases in government purchases
- Increases in the price level in the rest of the world
Inflation caused by an increase in aggregate demand, is inflation caused by factor 4 (An increase in the demand for goods). The three most likely causes of an increase in aggregate demand will also tend to increase inflation:
- Increases in the money supply This is simply factor 1 inflation.
- Increases in government purchases The increased demand for goods by the government causes factor 4 inflation.
- Increases in the price level in the rest of the world Suppose you are living in the United States. If the price of gum rises in Canada, we should expect to see less Americans buy gum from Canadians and more Canadians purchase the cheaper gum from American sources. From the American perspective the demand for gum has risen causing a price rise in gum; a factor 4 inflation.
Inflation in SummaryCost-push inflation and demand-pull inflation can be explained using our four inflation factors. Cost-push inflation is inflation caused by rising prices of inputs that causes factor 2 (The supply of goods goes down) inflation. Demand-pull inflation is factor 4 inflation (The demand for goods goes up) which can have many causes.
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