Cost of capital is minimum return required for the company to
generate value for the project & the investors. Capital can
take in any form, like Common equity, Preferred equity, debt etc.
It is extensively used in capital budgeting to decide whether the
project is worth generating the value using the resources and
finances. In the narrower sense, it refers to one capital source,
can be either equity cost or before tax cost of debt.
WACC (weighted average cost of capital): It is the average
interest that the company pays to its capital providers from
different sources like common equity, debt, preferred equity and
any other long-term debt. It is calculated by taking the market
value weights and the cost of each capital. It is more a broad
measure than just one source of cost of capital.
Common Equity
Advantages:
- Provides highest rate of return in the long run
- Has ownership control
- Share company's profits in the form of dividends
- Have voting rights, generally, proportional to the % of shares
held
Disadvantages:
- Very volatile and is very risky investment as, at the time of
selling shares, price of the stock can be less than that of the
price bought originally.
- Possibility of dilution of control
Preferred equity
Advantages:
- Less volatile than that of common equity and hence is less
risky.
- Given preference over common equity both in profit sharing and
in the event of liquidation. That is, preferred equity shareholders
receive dividends before the common equity shareholders
- No potential dilution of the control
Disadvantages:
- Preferred stock is sometimes called by the issuer
- Lower returns than that of the common equity
Potential conflict between rating agencies and the companies to
which they issue ratings:
- issuer-pays model: Rating agencies are often compensated by the
companies who pay them to rate their debt. Problem with this model
is that there is an incentive conflict. To get more business,
credit rating agencies may give higher ratings than deserved.