Aswath Damodaran1 Session 5: Betas Aswath Damodaran.

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Aswath Damodaran1 Session 5: Betas Aswath Damodaran

2 Estimating Beta The standard procedure for estimating betas is to regress stock returns (R j ) against market returns (R m ) - R j = a + b R m where a is the intercept and b is the slope of the regression. The slope of the regression corresponds to the beta of the stock, and measures the riskiness of the stock. This beta has three problems: It has high standard error It reflects the firm’s business mix over the period of the regression, not the current mix It reflects the firm’s average financial leverage over the period rather than the current leverage.

Aswath Damodaran3 Beta Estimation: Is this Embraer’s beta?

Aswath Damodaran4 Or is this it?

Aswath Damodaran5 And watch out if your regression looks too good…

Aswath Damodaran6 Determinants of Betas

Aswath Damodaran7 Bottom-up Betas

Aswath Damodaran8 Why bottom-up betas? The standard error in a bottom-up beta will be significantly lower than the standard error in a single regression beta. Roughly speaking, the standard error of a bottom-up beta estimate can be written as follows: Std error of bottom-up beta = The bottom-up beta can be adjusted to reflect changes in the firm’s business mix and financial leverage. Regression betas reflect the past. You can estimate bottom-up betas even when you do not have historical stock prices. This is the case with initial public offerings, private businesses or divisions of companies.

Aswath Damodaran9 Estimating a bottom up beta for Embraer in 2004 Embraer is in a single business, aerospace, where there are no other listed firms in Latin America and very few in emerging markets. To estimate the bottom up beta, we therefore used all publicly listed companies in the aerospace business (globally), averaged their betas and estimated an average unlevered beta for the business of 0.95 We then applied Embraer’s gross debt to equity ratio of 18.95% and the Brazilian marginal tax rate of 34% to estimate a levered beta for the company. BusinessUnlevered BetaD/E RatioLevered beta Aerospace %1.07 Levered Beta= Unlevered Beta ( 1 + (1- tax rate) (D/E Ratio) = 0.95 ( 1 + (1-.34) (.1895)) = 1.07 The fact that most of the other companies in this business are listed on developed markets is not a deal breaker, since betas average to one in every market. The fact that Brazil may be a riskier market is captured in the equity risk premium, not in the beta.