"Income taxes are NOT included in a product's price. One doesn't even know what they are going to be from year to year."
Where does the money come from to pay corporate income taxes?
IF any income taxes are due they come from PROFIT. IF there is no profit there are NO income taxes. Examination of any corporate return will show that profit can be manipulated from year to year to minimize profit.
Economic theory postulates that a business will try to maximize its profit over time that output is not changed income tax or no income tax.