Risk and Return
The tradeoff between Risk and Return is the principles theme in the investment decisions. Investors take a risk when they expect to be rewarded for taking it. People invest because they hope to get a return from their investment. The Chinese symbols for risk, reproduced below, give a much better description of risk the first symbol is the symbol for “danger”, while the second is the symbol for “opportunity”, making risk a mix of danger and opportunity.
Return
Benefits for holding an investment over period of time are called return. Some return measures are more useful than others:
Components of Return
There are two components of return:
Yield: The basic component that usually comes to mind when discussing investing returns is periodic cash flows (income) on investment, either interest or dividends.
Capital Gains: The second component is also important, that is the appreciation in the price of the assets, commonly called capital gain (loss). It is simply the price change. It is the difference between the purchase price and the price at which the assets can be sold
Formula
Where: yield component = 0 or + Price change component = 0, +, –
Holding Period Return
The simplest measure of return is the holding period return. This calculation is independent of the passage of time and considers only a beginning point and an ending point. It makes no difference if the holding period return is calculated on the basis of a single share or 100 shares:
Formula
Illustration 1: Someone might buy 100 shares of stock at Rs. 25 face value, receives a 10 cent per share dividend, and later sell the shares for Rs. 30. The holding period return is?
Illustration 2: Determine the return of the two video machines and decide which is to select?
Machine A
 Purchase price last year: Rs. 20,000
 Current market value: Rs. 21,500
 Aftertax cash receipt: Rs. 800
Machine B
 Purchase price 4 years ago, but market value dropped from Rs.12,000 to Rs.11,800 this year
 Aftertax cash receipt: Rs. 3,700
Choose Machine B on the basis of high return compared to Machine A
Return Relative
The return relative (RR) obtains by adding 1.0 to the Holding period return.
Formula
Illustration 3: Assume that you purchase a 10 percent coupon bond @ 960, held one year and sold for 1,020. Calculate return relative?
Real Rate of Return
All are the returns are nominal or money returns. They measure amount or change in the value of investment but ignore the purchasing power of the currency. To capture this dimension we have to incorporate real return of return or Inflation adjusted return. Consumer price index is used to measure the rate of inflation. To calculate inflation adjusted return we use following formula:
TRIA = Total Return Inflation Adjusted, NR = Nominal Return, IF = Rate of inflation
Illustration 4: Nominal return for OGDCL in 2008 was 28.57%. The rate of inflation was 1.61%. Calculate real return (inflation adjusted) for 2008?
Risk
It is not sensible to talk about investment returns without talking about risk, because investment decisions involve a tradeoff between the two—return and risk are opposite sides of the same coin. Investors should be “willing to purchase a particular asset if the expected return is sufficient to compensate risk. Risk is the chance that the actual outcome of an investment will differ from the expected outcome.
Types of Risk
Dividing total risk into its two components, a general component and a specific component:
Systematic (Market) Risk
Risk of broad macro factors affecting all securities, the investor cannot reduce or escape this part of the risk, because no matter how well he or she diversifies, the risk of the overall market cannot be avoided. Clearly, market risk is critical to all investors.
Nonsystematic (Nonmarket) Risk
Nonsystematic Risk is the variability in a security’s total returns not related to overall market variability is called the nonsystematic (nonmarket) risk. This risk is unique to a particular security or market so it can be reduce by diversification.
Measuring Future Risk (Single Investment)
Risk is often associated with the dispersion in the likely outcomes. Dispersion refers to variability. Knowing the mean of series is not enough; the investor also needs to know something about the variability in the returns.
Probability Distribution
A set of possible values that a random variable assumes and their associated probabilities of occurrence are called probability distribution, weather is random variable chance will be rain and no rain. Today is probability is 40% and 60 %. It is total judgmental process to access the chances or probability of occurrence an event.
Expected Rate of Return
If we multiply each possible outcome’s by its probability of occurrence and then sums these products.
Formula
Illustration 5: Draw payoff matrix and find out expected rate of return for the following probability distribution.
Standard Deviation
The most commonly used measure of dispersion over some period of years is the standard deviation, which measures the deviation of each observation from the arithmetic mean of the observations and is a reliable measure of variability, because all the information in a sample is use. The standard deviation is a measure of the total risk of an asset or a portfolio. The standard deviation can be calculated by
Illustration 6: Calculate Standard deviation for Illustration 5 above
Variance
Measure of variability, the mean square deviation from mean or expected values, it is square root of standard deviation.
Illustration 7: Calculate Variance for Illustration 4
Coefficient of variation
The ratio of the standard deviation of a distribution to the mean of that distribution, it is a measure of relative risk.
Illustration 8: Comparison of 2 Investments in terms of Risk & Return. Which is the best Investment?
Name of Investment 
Risk (Std Dev) 
Expected Return

TBill  5%  10%

Shares  25%  30% 
>> Read Risk and Return MCQS.