The biggest reason why you would want to use higher taxes on the rich and the nation’s largest corporations if you’re going to pay for stimulative job-creation measures is not just because these would be the least disruptive offsets for an economy waiting to heal. Just as high on the list is the fact that low taxes on the ultra-rich distorts the economy and makes future growth nearly impossible.

A perfect example of this comes from the Washington Post’s salutary article today on capital gains taxes. This is something that hardly even gets talked about anymore, but it’s at the heart of at least one of the pay-fors on the White House’s list, the carried interest loophole. The only reason that hedge fund managers are paying drastically lower tax rates is because the taxes on their capital gains, which they are calling their entire income, is drastically lower than the income tax. And this has produced massive inequality, pushed along by the rich contributors of politicians in both parties:

For the very richest Americans, low tax rates on capital gains are better than any Christmas gift. As a result of a pair of rate cuts, first under President Bill Clinton and then under Bush, most of the richest Americans pay lower overall tax rates than middle-class Americans do. And this is one reason the gap between the wealthy and the rest of the country is widening dramatically [...]

Advocates for a low capital gains rate say it spurs more investment in the U.S. economy, benefiting all Americans. But some tax experts say the evidence for that theory is murky at best. What is clear is that the capital gains tax rate disproportionately benefits the ultra-wealthy.

Most Americans depend on wages and salaries for their income, which is subject to a graduated tax so the big earners pay higher percentages. The capital gains tax turns that idea on its head, capping the rate at 15 percent for long-term investments. As a result, anyone making more than $34,500 a year in wages and salary is taxed at a higher rate than a billionaire is taxed on untold millions in capital gains.

While it’s true that many middle-class Americans own stocks or bonds, they tend to stash them in tax-sheltered retirement accounts, where the capital gains rate does not apply. By contrast, the richest Americans reap huge benefits. Over the past 20 years, more than 80 percent of the capital gains income realized in the United States has gone to 5 percent of the people; about half of all the capital gains have gone to the wealthiest 0.1 percent.

It’s a very long and very accurate article. This has been a problem ever since Alan Greenspan intoned that the proper capital gains tax rate was zero. That has led to moves ever closer to that ideal, and subsequent gains in overall wealth and political influence at the top. If the ultra-rich have a disproportionate share of the nation’s wealth, with political campaigns being what they are they will control the acceptable range of policy. As a result, you have an unbalanced economy. And inequality on this scale both damages GDP growth and makes the economy very susceptible to financial crises, as all that money looks for some gamble to strike it even richer.

And this has shifted over time. Ronald Reagan raised capital gains tax rates; under Clinton they were lowered. And now Republican candidates are talking about zeroing them out. This is despite the fact that there’s no empirical evidence to show that making rates on investment cheaper do anything to increase investment and grow the economy.

The Post has a great graphic identifying the winners of the capital gain tax cuts. That’s the policy reason for action: there’s just nothing to the argument that low tax rates help growth. Now, does it follow that lowering tax rates on wage earners, the effective outcome of cutting the payroll tax, is also an argument without merit? That’s the subject of my next post.