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FIN 531 Corporate Finance Cheat Sheet by

FIN 531 Mid-Term Cheat Sheet

Calcul­ating Portfolio Risk

σ2=Wa2σa2+Wb2σb2+2(WaWb Cor σaσb)
σx=standard deviation
σ2= variance of portfolio
Wx = weight of stock in portfolio
Covariance of stocks = correl­ation *σab
σ = risk of an individual stock
ß = Market risk
If you need to find out the standard deviation, take the square root of the answer. Variance, leave it squared.

Book Rate of Return

Book Rate of Return=
Book income­/book assets

Payback & Discounted Payback Period

Payback = # of years to payback investment (no NPV adjust­ment)
Discounted = # of years to payback investment NPV adjust­ment)
NPV= C0+(C1/(1+r1))+(C2/(1+r2))..............(Ct/(1+rt))

Non-co­nstant growth valuation stock

G1= 20% for 2 years; G2=5% for rest of time
D1=1.2­5(1.20) = 1.50
D3=1.2­5(1.20)2(1.05) =1.89

Internal rate of return | IRR

NPV must =0 to calculate
Must use Excel to calculate
Pitfall 1 = Lending or borrowing?
Pitfall 2 = Multiple rates of return (when cash goes from + to -)
Pitfall 3 = Mutually exclusive projects- IRR sometimes ignores magnitude of a project
Pitfall 4 – What Happens When There is More than One Opport­unity Cost of Capital

Term Structure Assumption
We assume that discount rates are stable during the term of the project.
This assumption implies that all funds are reinvested at the IRR.
This is a false assump­tion.

Covariance of multiple stocks

With 100 securi­ties, the box is 100 by 100.The variance terms are the diagonal terms, and thus there are 100 variance terms. The rest are the covariance terms. Because the box has(100 × 100) terms altoge­ther, the number of covariance terms is:Number of covariance terms = 1002– 100 = 9,900Half of these terms (i.e., 4,950) are different.

bWith 50 stocks, all with the same standard deviation (.30), the same weight in the portfolio (.02), and all pairs having the same correl­ation coeffi­cient (.40), the portfolio variance is
:σ2= 50(.02­)2(.30)2+ (50)2– 502(.40)­(.30)2= .03708σ = .193, or 19.3%
c.For a fully divers­ified portfolio, portfolio variance equals the average covari­anc­e:σ2= (.30)(.30­)(.40) = .036σ = .190, or 19.0%

Efficient Frontier


Present Value of a Growing Perpetuity

PV = CF1 / r - g r > g

Bond Valuation

Duration = [1xPV (c1)]/­PV+­[2xPV (c2)]/ PV...+­(Tx­PV(­CT)]/PV
Modified Duration = volatitliy (%)=du­rat­ion­/(1­+yield)

DPS Calcul­ation


Sharpe Ratio = (r-rf­)/(σ)

Risk premium
Standard Deviation
Ratio of risk premium to standard deviation. Measures risk-a­djusted perfor­mance of investment managers


The Y-inte­rcept of the SML is equal to the risk-free interest rate. The slope of the SML is equal to the market risk premium and reflects the risk return trade off at a given time.

E(Ri) is an expected return on security
E(RM) is an expected return on market portfolio M
β is a nondiv­ers­ifiable or systematic risk
RM is a market rate of return
Rf is a risk-free rate

Efficient Frontier

The efficient frontier is the set of optimal portfolios that offers the highest expected return for a defined level of risk or the lowest risk for a given level of expected return. Portfolios that lie below the efficient frontier are sub-op­timal, because they do not provide enough return for the level of risk.

Stock Returns

Stock Price @ time
D =

CAPM = Capital Asset Pricing Model

rf= risk free rate
rm = market rate
i = investment
E(r) = expected return
Expected risk premium on stock=
beta x expected risk premium on market
Beta is the extent to which a stock moves with the market. CAPM says that the higher the Beta, the higher the risk

Market Efficiency

1.) Weak = Market reflects past info
2.) Semi-S­trong = Past & Current public info is reflected
3.) All inform­ation is reflected in the stock price (public & private)
Efficient Market - Market in which inform­ation is reflected in stock prices quickly + correctly

Profit­ability Index

PI = NPV/In­ves­tment
Another Example - continued
Proj NPV Investment PI
A 230,000 200,000 1.15
B 141,250 125,000 1.13
C 194,250 175,000 1.11
D 162,000 150,000 1.08

Select projects with highest Weighted Avg PI
WAPI (BD) = 1.13(125) + 1.08(150) + 0.0 (25)
(300) (300) (300)
= 1.01

Captal Rationing

Capital Rationing - Limit set on the amount of funds available for invest­ment.

Soft Rationing - Limits on available funds imposed by manage­ment.

Hard Rationing - Limits on available funds imposed by the unavai­lab­ility of funds in the capital market.

Market Risk premium

For any invest­ment, we can find the opport­unity cost of capital using the security market line. With  = 0.8, the opport­unity cost of capital is:
r = rf + B(rm – rf)
r = 0.04 + [0.8 B (0.12 – 0.04)] = 0.104 = 10.4%

The opport­unity cost of capital is 10.4% and the investment is expected to earn 9.8%. Therefore, the investment has a negative NPV.

If return is 11.2% What is Beta?
r = rf + (rm – rf)
0.112 = 0.04 + (0.12 – 0.04)   = 0.9


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