Risk Analysis “Risk” generally refers to outcomes that reduce return on an investment

Meaning of Risk Potential for revenue to be lower and expenditures to be higher than “expected” when investment was made. Measured by variation in these factors Causes –Physical risk – physical loss of growing stock due to acts of God or uncontrollable acts of man –Market risk – changes in markets that cause variation in revenues and costs –Financial risk – changes in interest rates and associated opportunity cost

Meaning of Uncertainty No basis for estimating probability of possible outcomes –No experiential data

Probability Distribution Relationship between possible outcomes and the percentage of the time that a given outcome will be realized if the process generating the outcomes is repeated 100’s of times.

Mean = $2,000 Probability of 25% Mean = $6,000 Probability of 50% Mean = $10,000 Probability of 25%

Expected Revenue EVR = E(R) = ∑ P m R m N m Where, m = index of possible outcomes N = total number of possible outcomes P = probability of m th outcome R = possible revenues

Expected revenue of example E(R) = 0.25 x $2, x $6, x $10,000 = $6,000 Call this investment “risky”

Risk aversion Assume an investment with $6,000 future revenue that is guaranteed by US Government –E(R) = $6,000 x 1.0 = $6,000 –Call this investment “guaranteed” If an investor prefers the $6,000 guaranteed in the example above, to the $6,000 risky investment in the previous example they are “risk averse” –Have no tolerance for risk

Risk aversion If an investor is indifferent between the guaranteed $6,000 and the risky $6,000 then they are “risk neutral” If an investor prefers the risky $6,000 to the guaranteed $6,000 then they are “risk seekers” –They are willing to take a chance that they will get a return greater than $6,000

Risk-Return Relationship Because all investors have some risk aversion investment market must reward investors for taking higher risk by offering a higher rate of return in proportion to the risk associated with an investment

Variation Sum of squared deviations from expected revenue weighted by probability of outcome Variance = σ 2 = ∑ [R m – E(R)] 2 P m Standard deviation = (σ 2 ) 1/2 N m=1

Example DeviationDeviation 2 x Probability $2,000 - $6,000 = -$4,000$16,000,000x.25 = $4,000,000 $6,000 - $6,000 = $0$0 x.50 = $0 $10,000 - $6,000 = $4,000 $16,000,000x.25 = $4,000,000 Variance =$8,000,000 Standard deviation =$2,828

Comparing standard deviations Risk is higher if standard deviation is higher, but If expected values vary can’t compare their variation Need measure of relative risk, –Coefficient of variation = –Standard deviation / E(R) For example: $2,828/$6,000 = 0.47 –Standard deviation is 47% of expected value

Risk-free rate of return Risk-free rate assumption – r f = 3% is still a valid assumption Correct PV is (risk-free revenue)/(1+ r f ) n Example $6,000/(1.03) 5 = $5,176 Buy U.S. Treasury bond for $5,176, get $6,000 at maturity in 5 years

Real Risk-Free Interest Rate 10-Yr. Treas. Sec., 3-Yr. Moving Average

Risk Averse Investors Will only pay less than $5,176 for $6,000 5-year bond, i.e. –Discount $6,000 bond at rate of >3% –(risky E(R))/(1+RADR) n < (risk-free E(R)/(1+r f ) n How do we find risk-adjusted discount rate (RDAR)? –Get investor’s certainty-equivalent (CE) –Example, what risk-free return is analogous to $6,000

“Back Into” RDAR Correct present value = CE/(1+r f ) n = PV CE = (E(R))/(1+RADR) n (1+RADR) n = E(R)/PV CE RADR = (E(R)/PV CE ) 1/n -1 Example, CE = $4,000 Correct PV = $4,000/(1.03) 5 = $3,450 RADR = ($6,000/$3,450) 1/5 – 1 = 11.7%

Risk Premium k = RADR –r f =11.7% - 3% = 8.7% No “general rule” about what risk premium is or should be

Relative Measure of Risk Certainty-equivalent ratio, c r c r = CE/E(R) Example, c r = $4,000/$6,000 = 0.67 k = (1+r f )/(c r 1/n ) – (1+r f ) = 1.03/ – 1.03 = 8.6% See Table 10-2 –Higher risk equates to smaller c r

Relative Measure of Risk See Table 10-2 –Higher risk equates to smaller c r –Risk premiums decrease with longer payoff periods If know an investors CE don’t need RADR