Why don't most tax expenditures help much if your federal tax bill is zero? You don't qualify for tax breaks if your federal tax bill is zero. Taxes are an automatic stabilizer. Most tax expenditures are specifically for high-income people. Most tax breaks reduce taxable income, but reducing taxable income below zero does not reduce the tax bill.

1) the stages a new product goes through from beginning to end, i.e., the stages that a product passes through from introduction through growth, maturity, and decline. 2) the time from initial research and development to the time at which sales and support of the product to customers are withdrawn. 3) the period of time during which a product can be produced and marketed profitably.

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