What is the w-4 form used for

Employees fill out a W-4 form to let employers know how much tax to withhold from their paycheck based on filing status, dependents, anticipated tax credits and deductions, etc. If you don't fill it out correctly, you may end up owing taxes when you file your return.

Explanation:

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the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

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-shy

answer; functional fixedness;