Answer: decreases the multiplier effect, so that an increase in taxes reduces income by more.
Step-by-step explanation:
The multiplier effect is the increase aggregate production in the economy due to an increase in spending by the government. A crowding out effect refers to when the spending by the government is at the expense of the private sector such that the private sector is unable to invest and grow.
The multiplier effect will therefore decrease as private investment slows. This leads to lower incomes for people as the economy is not expanding. If the government were to tax people at that point, it would take more of their income than less.