Gross margin represents the amount of total sales revenue that a company retains after incurring the direct costs associated with producing the goods sold by the company.

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Learn what Modified Adjusted Gross Income (MAGI) is, how to calculate it, and why it matters—from Roth IRAs to Premium Tax Credits, Medicaid, and IRMAA surcharges.

John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, United States ...