Final answer:
Opponents of tax reforms argue that such reforms favor those with high income and may not increase saving due to the substitution effect.
Step-by-step explanation:
Opponents of tax reforms intended to raise saving argue that such reforms a. favor those with high income, and that saving may not rise because of the substitution effect.
In this context, the substitution effect refers to the tendency of individuals to consume more in the present when it becomes cheaper relative to future consumption, while the income effect refers to the reduction in present consumption due to the decrease in the buying power of income caused by lower interest rates. For Quentin, the substitution effect is stronger, leading to more present consumption and less saving.