human
What is a good argument against a flat tax?
assistant
A good argument against a flat tax is that it can lead to an inefficient distribution of resources. For example, if the rich pay a lower rate than the poor, then this could lead to a situation where the rich are incentivized to work less and invest more in order to reduce their taxable income, while the poor have no such incentive. This would result in a less efficient allocation of resources, which would ultimately harm society as a whole.