A rise in aggregate demand is what triggers DEMAND-PULL INFLATION.
Therefore, variables like rising government expenditure, declining tax rates, rising wealth, rising consumer confidence, and rising money supply might all lead to demand-pull inflation.
Demand-pull :When total demand exceeds total supply in an economy, inflation is said to result. As the economy travels along the Phillips curve, inflation will increase as real gross domestic product increases and unemployment decreases. This is sometimes referred to as "chasing too much money after too few goods."
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