IOW, people adjust their behaviors to high tax rates.
That's right. They produce less. That's not an outcome we desire.
The more you tax something, the less of it you get.
That's why we need to eliminate taxes on production (income taxes) and enact taxes on consumption (like the Fair Tax).
Consumption taxes don't really work either.
Companies lobby to get things exempt from sales or VAT tax so that it ends up being a confusing mess.
This is not something inherent in consumption taxes. It is a failing of ALL tax schemes.
Exemptions ARE tax expenditures!
That's why I have said countless times on this forum that it does not matter what kind of tax scheme you have if you allow exemptions, credits, or deductions. As soon as you allow them, it becomes immediately corrupted.
Our current income tax has $1.4 TRILLION in exemptions, deductions, and credits.
That's per YEAR. Not per decade. It should be no mystery why we are $21 trillion in debt.
Which is why I have said an equal number of times that the Fair Tax would have to have ZERO exemptions. As soon as you allow even the smallest exemption (for milk, say), then you have re-opened Pandora's box all over again.