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This paper studies the cost of equity and capital of three Bulgarian listed banks in the framework of the Modigliani-Miller (MM) theory of capital structure. It measures the impact of an increase in capital ratios on the equity risk (equity beta) of these banks. It finds that, historically, while more equity results in lower banksâ€™ systematic risk no causal relationship can be found between an increase in capital ratios and the predicted by the theory decrease in banksâ€™ systematic risk. MM irrelevance argument holds that a decrease in equity risk will lead to a decrease in the shareholdersâ€™ required (and expected) return on equity and thus offsetting the higher equity (capital) level. Thus, the results cannot find evidence in support of the so-called 'Modigliani-Miller' offset.

Capital Change and the Cost of Equity: Evidence from Bulgarian Banks. Is there a Modigliani-Miller offset?