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What is Beta?

By Madhuri ThakurMadhuri Thakur

Home » Finance » Blog » Valuation Basics » What is Beta?

What is Beta?

Introduction to Beta

In this article, we will see an outline on What is Beta? and we will also learn about the estimation of cost of equity The cost of equity (Ke) is the rate of return expected by shareholders.

 

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Risk-Free Rate

Risk-free security has no default risk, no volatility, and a beta of zero. Practically such a security does not exist and hence, we use securities issued by a political and stable government. Selecting the bond depends on the forecast horizon – short term or long term?

 

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The closest approximation we have to the risk-free rate is the yield on government bonds. Most analysts use long-term government bond yield. Ideally, the length of the forecast should be matched with the tenure of the bond used for the calculation of bond yield. For example, if a company has been forecast-ed for 10 years, we should use a 10-year bond yield as the risk-free rate.

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What is Beta?

Beta is a statistical measure of the variability of a company’s stock price in relation to the stock market overall. It is calculated by regressing the percentage change in a stock or portfolio against the percentage change in the market (usually as defined by an index like the SENSEX/NIFTY).

Thus, a beta of one (1) implies a stock that moves exactly with the market. Applying a beta of one (1) to CAPM would result in a premium over the risk-free rate equal to the average equity premium. A higher/lower beta means the stock is riskier/less risky and results in a greater/lesser required return. Most betas fall between 0.1 and 2.0 though negative and higher numbers are possible.

 

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The sensitivity of Beta is because of two has two components, the risk inherent in the assets of the business and the risk associated with the leverage applied to those assets. 

Determinants of Beta

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  • Product or service: The beta value for a firm depends upon the sensitivity of the demand for its products and services and of its costs to macroeconomic factors that affect the overall market.
  • Cyclical companies have higher than non-cyclical firms that sell more discretionary products will have higher betas than firms that sell less discretionary products.
  • Operating leverage: The greater the proportion of fixed costs in the cost structure of the business, the higher the beta.
  • Financial leverage: The more debt a firm takes on, the higher the beta will be of the equity in that business. Debt creates a fixed cost, interest expenses, that increases exposure to market risks.

Unlevering and Relevering Beta:

It is a statistical measure of the variability of a company’s stock price in relation to the stock market overall. However, if we are valuing a non-listed private company, we cannot find the beta as suggested above.

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Beta Calculation

Below are the methodologies utilized by various sources in calculating:

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Notes on Beta

The preferred beta methodology policy in India is that you should use Bloomberg provided Beta unless there is a good reason not to. However, for reference, the fundamentals of how beta is calculated are set out below.

1. Time horizon – Five Years

Studies have demonstrated that longer horizons give more accurate betas. Five years is considered an appropriate length of time to capture a stock’s movement while still reflecting current market dynamics. Shorter periods can reflect market or company aberrations more readily. Most major sources utilize this horizon.

2. Frequency – Monthly

More history is available for monthly stock prices, allowing generally more in-depth studies. Weekly results can suffer from distortions that derive from the day of the week selected for closing prices. Daily results can be distorted by the Fisher effect, whereby the end of day market movements are not matched with closing prices, as a closing price is recorded as the last trade, not necessarily trade at the end of the day.

3. Adjustment – To Tend towards One

It has been observed that as an industry/company matures, it acts more like the overall economy/market in general. Consequently, betas move more with the market over time. The raw beta will need adjustments to better reflect the tendency of betas over longer periods of time.

4. Underlying Index

Use the index of the country in which your company is located. In India, SENSEX 30 should be used.

Conclusion

In this article, we have learned about the estimation of cost of equity, we will find for private company…Till then, Happy Learning!

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