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Demand-pull inflation occurs when the aggregate demand in the economy exceeds the available supply of goods and services. This can be caused by expansionary policies and fiscal stimulus, which increase the disposable income of people, leading to higher demand for goods and services. Higher purchasing power also leads to an increase in demand, as people have more money to spend. Inflation-indexing wages can act as a buffer against demand-pull inflation by adjusting wages in line with the inflation rate, but it does not cause or increase demand-pull inflation. Rising interest rates have a dampening effect on demand, as they increase the cost of borrowing, leading to lower consumer spending, and hence do not cause demand-pull inflation.