I'm trying to retag some questions (such as this one) on the Board Game Stack Exchange, and the only good tag I can think of is "Selling".
But that seems inefficient, and a word that covers both buying and selling would be more useful to the site. The first word I thought of was transaction but that doesn't seem to cover it.
Someone has suggested to me business, but again it doesn't sound like it works in the context.
Is there not a single word (or a phrase shorter than 25 characters) for this?