MARGIN (Stocks) allows investors to buy securities/assets by borrowing money from a broker/banker. The margin is the difference between the market value of a stock/asset and the loan a broker/banker makes.
COST OF DEBT is interest rate times 1 minus the marginal tax rate (because interest is a tax deduction). An increase in the tax rate decreases the cost of debt.
FICA (FEDERAL INSURANCE CONTRIBUTIONS ACT) is the U.S. law requiring U.S. employers to match the amount of Social Security tax deducted from an employees paycheck.
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