Sheldon doesn't trust Penny's dry cleaner because he also makes keys, implying that people who don't focus on their comparative advantage aren't capable of performing well. His statement implies that we society would be better off if people specialize in one task.
Dry Cleaners Shouldn't Make Keys
Sheldon doesn't trust Penny's dry cleaner because he also makes keys, implying that people who don't focus on their comparative advantage aren't capable of performing well. His statement implies that we society would be better off if people specialize in one task.