It's not rocket science to conclude that whatever lowers the cost of capital formation, such as lowering the cost of investing in earthmovers, enables contractors to purchase more of them. Workers will have more capital to work with and as a result enjoy higher wages. Policies that raise the cost of capital formation such as capital gains taxes, low depreciation allowances and corporate taxes, thereby reduce capital formation, and serve neither the interests of workers, investors nor consumers. It does serve the interests of politicians who get more resources to be able to buy votes.
You might wonder how congressmen can get away with taxes and other measures that reduce our prosperity potential. Part of the answer is ignorance and 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.