You studied for two hours each day, for an entire week, before your first marketing exam. When you turned in the test, you felt confident that your effort would pay off. At the next class meeting, your instructor said she was considering curving the grades because the class average was lower than she had anticipated. All of a sudden, your 98% score did not have the same impact that it did when you first saw it! Now the guy next to you that got an 84% is likely to have an "A" grade too. As you analyze this situation, you realize that it parallels an economic system such as ________________, where even if you work harder than another person, you are likely to realize the same benefit.