Taxes also reduce transactions. I need my computer repaired. You and I agree that the job is worth $200. Suppose there's the imposition of a 30 percent income tax on you. That means you would net only $140 and might refuse the job. You might suggest that if I were willing to pay you $285 you would do the job because at that price your after-tax earnings will be $200 -- what doing the job is worth to you. There's a problem. The repair job was worth $200 to me, not $285. So it's my turn to say the heck with it, or would we and society be better off if you and I agreed to the repair job but did not tell anybody? I'd say yes, but we'd be criminals.
You might wonder how congressmen can get away with taxes and other measures that reduce our prosperity potential. Part of the answer is the anti-business climate promoted in academia and the news media. The more important reason is that prosperity foregone is invisible. In other words, we can never tell how much richer we would have been without today's level of congressional interference in our lives and therefore don't fight it as much as we should.