I edited

* [[Economic growth and labour]]

putting it into more of the standard Azimuth style, and polishing the English.

I also couldn't resist polishing a bunch of Nad's posts here. Nad: if you pick "Markdown+Itex" when posting a comment, you can use TeX and Markdown to make your comments utterly beautiful. Links, quotes, and math formulas become
easy.

As for the more important issue of elasticity, the elasticity of $y$ with respect to $x$ is defined as

$$\frac{d y / y}{d x / x} = \frac{d \ln y}{d \ln x}$$

It sounds like Frederik and I agree on this point now, and are just wondering whether people at the ILO are using the discrete approximation

$$\frac{\Delta y / y}{\Delta x / x}$$

or

$$\frac{\Delta \ln y}{\Delta \ln x}$$

Presumably in many real-world examples the difference between these two approximations is less than the uncertainty caused by noise in the data. Since nonmathematicians like division better than logarithms, I'd guess they use the first one. But that's just a guess.