"What is a white-economy merchant?"


A white-economy merchant is something :

 - in a narrow/technical sense that isn't illegal
 - in a slightly broader sense isn't flying under the radar because it's legally or morally dubious
 - in a broader sense, isn't going to be used as an example of "Why bitcoins should be banned"
 - in the broadest sense, something you can cite to the cynical as an example of bitcoins actually working as a legit means of exchange.

You can tell your mother about it in other words.