[bearmf]

Clearly designer jeans and fast food are more beneficial than casinos and zero-sum trading. The first two are at least somewhat useful, are not that addictive and do not harm anyone except maybe people who eat too much fast food. Casinos are of some entertainment value, but are very addictive and have negative effects on neighboring communities. Zero-sum trading is tricky, it is not that addictive but very few people benefit from it at all, less than from casinos and much less than from designer jeans. At the same time negative externalities probably exist but are not well studied.