Suppose everyone is highly productive, college educated, hard-working, etc. People still differ in their preferences for jobs—while some would prefer to be doctors than lawyers, others prefer to be lawyers than doctors, and so on—and everyone prefers to be a professional to being a trash collector, but as usual preferences vary across individuals. In order for this economy to function at all, someone needs to choose to be the trash collector. Who will be the trash collector, and in general terms how much will the job of trash collector pay?