Miller and Modigliani Capital Structure

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Capital Structure Miller and Modigliani’s theorem was first published in 1958 and it was a groundbreaking model in corporate finance. The M&M theorem on capital structure claims that in an efficient market and in the absence of taxes, bankruptcy costs and asymmetric information, the value of a firm is unaffected by how it is financed. That is, how the firm decides to raise capital, whether it is by taking on debt or by using existing equity, does not affect the value of the company. Market Timing and Capital Structure Article by Baker and Wurgler (2002) discusses equity “market timing”, i.e. practice of companies to issue shares when they are relatively expensive and repurchase them when they are cheap. According to MM model costs of different forms of capital do not vary independently because the markets are efficient and integrated, but in practice companies use equity market timing. Analysis shows that equity market timing is successful on average and companies tend to issue new shares when investors are too enthusiastic about future earnings also managers admit using market timing. Paper by Baker and Wurgler deals with the problem how market timing affects capital structure. Fluctuations in market value have very long-run impacts on capital structure. It is hard to explain this result within traditional theories of capital structure for example pecking order. Pecking order should prevent managers from issuing new equity entirely. Managerial entrenchment theory of capital structure by Zwiebel (1996) is partially consistent with market timing theory, but practice shows that managers are exploiting new investors instead of existing ones. Capital structure is the cumulative outcome of attempts to time the equity market. Fluctuations in the market-to-book ratio have considerable and lasting effects on leverage. Paper shows that these results are most consistent with market timing theory. None of tradeoff, pecking and managerial entrenchment theories can explain impact on capital structure. All of earlier mentioned theories have some significant flaws. Market timing theory looks as best explanation of empirical results in the sense that capital structure is a cumulative outcome of attempts to time the market. It seems that some other theories also have some explanatory power, and in some particular circumstances might be more important than market timing theory to explain changes in capital structure. But authors proved that if we have to choose just one theory, market timing theory would win because it has most explanatory power. Capital Structure and Firm Performance Berger and Emilia (2003) used profit efficiency as a new approach to test the corporate governance theory.

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