Just a quick question:
If you have a dollar, would you buy something that is worth 1) $0.90 or 2) $1.10?
My answer is "depends". It depends if I am in a desperate need of that something. It is a question on the word worth, which is also an important element in investing. But if that something happens to be a share, I will definitely choose 2). That way my $1 is well spent! In fact I managed to increase its value by 10%.
That is a crude way to introduce efficiency. Efficiency is getting the maximum output give fixed resources. In the previous example, my "output", or reward, would be -10% if I choose to buy 1) and +10% if i chose 2).
As you can see, efficiency is a relative measure. It is important as it affects operation costs and also infers the management's capability. In general, if a company is not efficient, it will incur high costs to produce its products or services, which will then be translated to the customers. Unless the company is the price setter, which is not usually the case, customers will stop doing business with them and find alternatives that are cheaper (customers ARE efficient). The company may increase its margin to compensate for the sales lost instead of being efficient, and thereby increase the cost, and continue to lose customers. This cycle will continue until the company realises the need to be efficient, or go bankrupt.
As investors, we want to make sure that our money is used efficiently to benefit the company (to make the company profitable in general) so it will in turn benefit us. I opine that efficiency is the most important factor to assess if a company is worthy investment.
How to assess efficiency then?
Efficiency is a relative measure, hence a single metrics by itself is not meaningful - something has to be measured against another. There are several metrics that can be useful in helping us make investing decisions.
Earnings Per Share (EPS)
While this may not be considered an efficiency measure, EPS is important. The shares do not make the earnings per se, but the EPS infers the earning power, or profitability, of the company. But as with all ratios, it is dependent on the numerator and the numerator. If the number of shares (denominator) is massive, it dilutes the earnings. Imagine having a piece of 16" pizza to go around 10 people. How about 20? 100? 1000? EPS gives us a quick glimpse of how much of that "pizza" are we going to be entitled to. The next question is, how much should we pay for it?
Earnings Yield
This is the proportion of the price paid that can be accounted by the earnings. (Although there is another interpretation, that is, how much earnings is there for every dollar of the shares paid. I find this interpretation a little warpy). This is a measure of how efficient our (the investor) capital can be used. Suppose a stock with EPS $0.20 that is going for $1. The earnings yield is 20%. Obviously, the higher the number, the better.
"Return in" Ratios
There are a number of return ratios, and the Return on Assets (or Capital) are particularly useful. It compares the earnings over the assets of the company. It shows how efficient the company is at deploying its asset in generating earnings.
Turnover Ratios
These are generally used to measure the company's management efficiency. The inventory and receivable turnover ratios are particularly useful if we want to assess if the company is good at managing its inventory and collecting outstanding payments respectively.
~yZhiFa