When you want to test which of many options are significant, instead of testing any or all, you're looking at a multiple comparison test.
I'm a research economist at the Bureau of Labor Statistics, interested primarily in econometrics. Particularly, I've done work in multiple comparison hypothesis testing and its applications in economics -- from finance to time-series forecasting.
Hobby economics topics include patent/copyright law and the financing of intellectual public goods and the scale economies implicit in a lot of new technologies, especially open-source software.
And if you find links that don't work (as of Feb 15, 2005) it's because I'm working on them as we speak.
This article from Wired points out how lowering the fixed-costs of selling a variety of things makes low-demand products suddenly viable.
This idea is right. And it's the reason Amazon is killing Barnes & Noble, Netflix is killing Blockbuster, and iTunes is killing Tower Records.
The upshot for consumers? More diversity, more choice. Search becomes important.

