Something very astonishing that I’ve learned only recently is that it’s probably not a good idea to donate your used clothing to companies that then export it to third-world countries (see here for a short discussion of the issue).

The ongoing imports of used clothes crushes the local industry, and the profits flow back to traders in the exporting countries. For locals, it has become even more promising to take part in this trading than to build a local industry. In contrast, of course, donations of clothings for victims of catastrophes makes sense.