Our freeways would be much safer without two classes of drivers - the speedsters and the slowpokes. A speedster is anyone who drives faster than you do. The slowpokes, on the other hand, are the drivers you have to dodge because they're slower than you are. Get rid of these mobile menaces and driving would be a pleasure. Naturally, once we purged the highways of these menaces, you or I would end up filling the role of one of these drivers. If I'm the slowpoke then, by default, you become the speedster.
Contracting might be much simpler if we could get rid of two classes of contractor - the high-priced rip-off artists and the low-ball parasites. The rip-off artist is defined by how much higher his rates are than yours. The low-ball parasites, on the other hand, charge less than you. If we could just get rid of these two classes of contractor, business would be fun because fixing things is just about all we'd have to think about.