Modigliani and Miller Theory

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Modigliani and Miller proposition one

(Modigliani & Miller 1958) assume that the composition of the firm's capital Structure is unimportant on the market value of all firms' securities, and consequently the firm's performance and shareholders' value.

“The market value of any firm is independent of its capital structure and is given by capitalizing its expected return at the rate appropriate to its class. “This model depends on two keys, arbitrage and homemade alternative (borrowing on personal account). Arbitrage is the process that ensures that two firms differing on laying their capital structure must have the same performance. At the same time the homemade alternative describes that an investor holding an equity stake in a levered firm can sell his stake, raise a personal loan equal to the share that he held in the levered firm, spend the proceeds in a firm that is not levered and increase his income without additional cost. They assume that the shares of the firms within a given class both have the same expected return and the same probability distribution of expected return, and therefore can be considered perfect substitutes for each other.

Modigliani and Miller proposition two
This proposition is derived from the first one and it concerns he performance of a Common stock in companies whose capital structure contains some debt. The expected rate of return of a stock of any company belonging to a class is a linear function of the firm's leverage.

“The expected yield of a share of stock is equal to the appropriate capitalization rate for a pure equity stream in the same risk class, plus a premium related to financial risk equal to the debt-equity ratio times the spread between the capitalization rate and the cost of debt. "

Proposition explains that the firm's assets will generate stream of cash flows or profits, and the assessment of the...

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