In this post, the fourth in my data update series, I turn my focus to the cost of capital. While the discussion of cost of capital is often obscured by debates about risk and return models, it is a number central to much of what we do in corporate finance and valuation, and it predates modern portfolio theory. You cannot run a business without a sense of what you need to make on your investments to break even and you cannot value a business without a measure of your opportunity cost.
The Swiss Army Knife of Finance
I teach two classes, corporate finance and valuation, and I wear different hats, when looking at the same questions. In corporate finance, my focus is on how to run a business, using fundamental financial principles, and in valuation, I shift my attention to how value that business, using the same principles. Like Waldo, the cost of capital is a constant part of both classes, playing a key role in almost every discussion.
In the corporate finance class, it shows up in each of the three big questions that every business has to answer. It helps you answer the first one, on where you should direct your investments, by suppling your business with a hurdle rate or rates for investments, with riskier investments having to meet a higher threshold, to be acceptable.
In capital structure, the cost of capital becomes an optimizing tool that helps you decide the right mix of debt and equity.
In dividend policy, the cost of capital becomes the divining rod for whether you should be returning more or less cash to your stockholders. If you operate in a business where your returns on new investments consistently fall short of your cost of capital, you should be returning more cash to your investors.
In the valuation class, the cost of capital is the discount rate that you use to bring operating cash flows back to today, to arrive at a value for a business. It has, unfortunately, also become the instrument that analysts use to bring their hopes, fears and worries into value, adding premiums to the discount rate, if an asset is illiquid, or reducing it, if it provides other benefits.
In short, it is difficult to do financial analysis without at least getting a sense of what the cost of capital is, for a business. The many uses to which it is put has also meant that it has become all things to all people, a number that is misused, misestimated and misunderstood.
The Mechanics of Estimating Cost of Capital
About a year ago, in the context of my 2015 data update, I had an extensive post on the mechanics of computing cost of capital. Rather than repeat that post, I will ...