What are the limitations of the multiplier effect?

The multiplier effect has several limitations, including the assumption of constant marginal propensities to consume and save, which may not hold true in real economies. It also relies on the initial increase in spending being fully realized, but factors like inflation, interest rates, and consumer confidence can dampen actual outcomes. Additionally, the multiplier can be less effective in economies with significant leakages, such as high imports or taxes, which reduce the impact of initial spending. Lastly, timing and the capacity of the economy to absorb additional demand can also affect the multiplier's effectiveness.