An income tax rate increase will most likely aggregate demand and aggregate supply.

decrease; decrease

Explanation:

Aggregate demand means the total quantity that would be purchased irrespective of the price levels. Aggregate supply means the total quantity of the goods or services which the firms will sell at a price that is given in the economy. So when the income tax rate increases the aggregate demand and aggregate supply of the products will both decrease.

The increase and decrease in the tax rates brings a shift in the aggregate demand and aggregate supply curve. Other factors which influence these curves are interest rates, income , exchange rates and inflation rates.

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