So I was interested to see he authored an attack on the flat tax – and I was happy after I read his column. Why? Well, because his arguments are rather weak. So anemic that it makes me think there’s actually a chance to get rid of America’s corrupt internal revenue code.

There are two glaring flaws in his argument. First, he demonstrates a complete lack of familiarity with the flat tax and seemingly assumes that tax reform simply means imposing one rate on the current system.

Here’s some of what he wrote in a Wall Street Journal column.

Many useful steps could be taken to simplify the personal income tax. But, contrary to much misleading rhetoric, flattening the rate structure isn’t one of them. The truth is that 100% of the complexity inheres in the definition of taxable income, which takes up millions of words in the tax laws. None inheres in the progressive rate structure. If you don’t believe that, consider the fact that the corporate income tax is virtually flat once a corporation passes a paltry $75,000 in taxable income. Is it simple? Back to the personal tax. Figuring out your taxable income can be quite an effort. But once that is done, most taxpayers just look up their tax bill on an IRS-provided table. Those with incomes above $100,000 must perform a simple calculation that involves multiplying two numbers together and adding a third. A flat tax with an exemption would require precisely the same sort of calculation. The net reduction in complexity? Zero.

I can understand how an average person might think the flat tax is nothing more than applying a single tax rate to the current system, but any public finance economist must know that the plan devised by Professors Hall and Rabushka completely rips up the current tax system and implements a new system based on one tax rate with no double taxation and no loopholes.

Heck, the Hall/Rabushka book is online and free of charge. But Blinder obviously could not be bothered to understand the proposal before launching his attack.

What about his second mistake? This one’s a doozy. He actually assumes that taxable income is fixed, which is a remarkable error for anyone who supposedly understands economics.

…flattening the rate structure won’t make the tax code any simpler. It would, however, make the tax system far less progressive. Do the math. …Someone with $20 million in taxable income pays nearly $7 million in taxes under the current rate structure, with its 35% top rate. Replace that with a 23% flat tax, and the bill drops to just under $4.6 million.

In other words, he assumes that people won’t change their behavior even though incentives to engage in productive behavior are significantly altered.

In a previous post, I showed how rich people dramatically increased the amount of income they were willing to earn and report after Reagan lowered the top tax rate from 70 percent to 28 percent.

To Blinder, this real-world evidence doesn’t matter – even though the rich paid much more tax to the IRS after Reagan slashed tax rates.

For more information, here’s my flat tax video.

And here’s the video on the global flat tax revolution. Interestingly, there are now about five more flat tax jurisdictions since this video was made – though Iceland abandoned its flat tax, so there are some steps in the wrong direction.

Makes you wonder. If the flat tax is such a bad idea, why are so many nations doing so well using this simple and fair approach?

But be careful, as this cartoon demonstrates, simplicity can mean bad things if the wrong people are in charge.

This means teaching folks on the left that tax policy affects incentives to earn and report taxable income. As such, I try to explain, this means it is wrong to assume a simplistic linear relationship between tax rates and tax revenue. If you double tax rates, for instance, you won’t double tax revenue.

But it also means teaching folks on the right that it is wildly wrong to claim that “all tax cuts pay for themselves” or that “tax increases always mean less revenue.” Those results occur in rare circumstances, but the real lesson of the Laffer Curve is that some types of tax policy changes will result in changes to taxable income, and those shifts in taxable income will partially offset the impact of changes in tax rates.

However, even though both sides may need some education, it seems that the folks on the left are harder to teach – probably because the Laffer Curve is more of a threat to their core beliefs.

If you explain to a conservative politician that a goofy tax cut (such as a new loophole to help housing) won’t boost the economy and that the static revenue estimate from the bureaucrats at the Joint Committee on Taxation is probably right, they usually understand.

But liberal politicians get very agitated if you tell them that higher marginal tax rates on investors, entrepreneurs, and small business owners probably won’t generate much tax revenue because of incentives (and ability) to reduce taxable income.

To be fair, though, some folks on the left are open to real-world evidence. And this IRS data from the 1980s is particularly effective at helping them understand the high cost of class-warfare taxation (click to enlarge).

There’s lots of data here, but pay close attention to the columns on the right and see how much income tax was collected from the rich in 1980, when the top tax rate was 70 percent, and how much was collected from the rich in 1988, when the top tax rate was 28 percent.

The key takeaway is that the IRS collected fives times as much income tax from the rich when the tax rate was far lower. This isn’t just an example of the Laffer Curve. It’s the Laffer Curve on steroids and it’s one of those rare examples of a tax cut paying for itself.

Folks on the right, however, should be careful about over-interpreting this data. There were lots of factors that presumably helped generate these results, including inflation, population growth, and some of Reagan’s other policies. So we don’t know whether the lower tax rates on the rich caused revenues to double, triple, or quadruple. Ask five economists and you’ll get nine answers.

But we do know that the rich paid much more when the tax rate was much lower.

This is an important lesson because Obama wants to run this experiment in reverse. He hasn’t proposed to push the top tax rate up to 70 percent, thank goodness, but the combined effect of his class-warfare policies would mean a substantial increase in marginal tax rates.

We don’t know the revenue-maximizing point of the Laffer Curve, but Obama seems determined to push tax rates so high that the government collects less revenue. Not that we should be surprised. During the 2008 campaign, he actually said he would like higher tax rates even if the government collected less revenue.

That’s class warfare on steroids, and it definitely belong on the list of the worst things Obama has ever said.

But I don’t care about the revenue-maximizing point of the Laffer Curve. Policy makers should set tax rates so we’re at the growth-maximizing level instead.

To broaden the understanding of the Laffer Curve, share these three videos with your friends and colleagues.

This first video explains the theory of the Laffer Curve.

This second video reviews some of the real-world evidence.

And this video exposes the biased an inaccurate “static scoring” of the Joint Committee on Taxation.

And once we educate everybody about the Laffer Curve, we can then concentrate on teaching them about the equivalent relationship on the spending side of the fiscal ledger, the Rahn Curve.

They find that boosting the top tax rate to 50 percent will slow economic performance. And because of both macroeconomic and microeconomic responses, tax revenues over the next 10 years are likely to drop by the equivalent of more than $550 billion. Here’s a key paragraph from the executive summary of the new study.

The country is suffering from a 50%-­plus marginal tax rate which even its architect admits was imposed without economic purpose. Now our analysis shows that the policy is set for failure: at best leading to flat growth for a decade and £350bn of lost revenue. The Chancellor should seize the occasion of the 2011 budget to reverse this disaster promptly, for the benefit of public revenues, economic growth, the government’s standing with domestic wealth-creators, and the UK’s reputation with world business.

The authors urge Prime Minister Cameron to reverse this disastrous policy, but the odds of that happening are very slight. I hope I’m wrong, but I have repeatedly noted that Cameron almost always makes the wrong choice when deciding between liberty and statism.

President Obama wants to impose similar policies in the United States and there is every reason to expect similarly poor results. I’ve already posted evidence from IRS data showing that the rich paid much more tax following the Reagan tax cuts, so it shouldn’t shock anybody when the reverse happens if Obama is successful in moving America back toward a 1970s-style tax system.

To emphasize these critical points, let’s close with two videos. This first video explains the Laffer Curve and why politicians are foolish if they assume that there is a fixed linear relationship between tax rates and tax revenue.

This second video debunks the notion of class-warfare tax policy.

I fully expected that GOPers would fold on this issue several months ago because Democrats were using the class-warfare argument that Republicans were holding the middle class hostage in order to protect “millionaires and billionaires.” Republicans usually have a hard time fighting back against such demagoguery, and I was especially pessimistic since Republican Senators had to stay united to block Senate Democrats from pushing through Obama’s plan for higher tax rates on the so-called rich.

But the GOP surprised me earlier this year with their united opposition to higher taxes, and they stayed strong again yesterday in blocking a bill that would raise tax rates on upper-income taxpayers. Here’s an excerpt from the New York Times.

Republicans voted unanimously against the House-passed bill, and they were joined by four Democrats — Senators Russ Feingold of Wisconsin, Joe Manchin III of West Virginia, Ben Nelson of Nebraska, and Jim Webb of Virginia — as well as by Senator Joseph I. Lieberman, independent of Connecticut. “You don’t raise taxes if your ultimate goal, if the main thing is to create jobs,” said Senator John Thune, Republican of South Dakota, echoing an argument made repeatedly by his colleagues during the floor debate. The Senate on Saturday also rejected an alternative proposal, championed by Senator Charles E. Schumer of New York, to raise the threshold at which the tax breaks would expire to $1 million. Some Democrats said that the Republicans’ opposition to that plan showed them to be siding with “millionaires and billionaires” over the middle class.

Not only did GOPers stand firm, but they were joined by five other Senators (including four that have to face the voters in 2012). This presumably means Democrats will now have to compromise and agree to a plan to extend all of the 2001 and 2003 tax cuts.

At the risk of being a Pollyanna, I wonder if the politics of hate and envy is falling out of fashion.

Obama’s plan for higher tax rates hopefully is now dead, but that’s just one positive indicator. It’s also interesting that both of the big “deficit reduction” plans recently unveiled, the President’s Fiscal Commission and the Domenici-Rivlin Debt Reduction Task Force Report, endorsed lower marginal tax rates – including lower tax rates for those evil rich people. Both proposals also included lots of tax increases, so the overall tax burden would be significantly higher under both plans, but it is remarkable that the beltway insiders who dominated the two panels understood the destructive impact of class-warfare tax rates. Maybe they watched this video.

CBO’s long-run perspective, as shown by this excerpt, is that deficits reduce output by “crowding out” private capital and that anything that results in lower deficits (or larger surpluses) will improve economic performance – even if this means big increases in tax rates.

CBO has also examined an alternative fiscal scenario reflecting several changes to current law that are widely expected to occur or that would modify some provisions of law that might be difficult to sustain for a long period. That alternative scenario embodies small differences in outlays relative to those projected under current law but significant differences in revenues: Under that scenario, most of the cuts in individual income taxes enacted in 2001 and 2003 and now scheduled to expire at the end of this year (except the lower rates applying to high-income taxpayers) are extended through 2020; relief from the AMT, which expired after 2009, continues through 2020; and the 2009 estate tax rates and exemption amounts (adjusted for inflation) apply through 2020. …Under those alternative assumptions, real GDP would be…lower in subsequent years than under CBO’s baseline forecast. …Under that alternative fiscal scenario, real GDP would fall below the level in CBO’s baseline projections later in the coming decade because the larger budget deficits would reduce or “crowd out” investment in productive capital and result in a smaller capital stock.

There’s nothing necessarily wrong with CBO’s concern about deficits, but looking at fiscal policy through that prism is akin to deciding who wins a baseball game by looking at what happened during the 6th inning. Yes, government borrowing drains capital from the productive sector of the economy. And nations such as Greece are painful examples of what happens when governments go too far down this path. But taxes also undermine economic performance by reducing incentives to work, save, and invest. And nations such as France are gloomy reminders of what happens when punitive tax rates discourage productive behavior.

What’s missing for CBO’s analysis is any recognition or understanding that the real problem is excessive government spending.

Regardless of whether spending is financed by borrowing or taxes, resources are being diverted from the private sector to government. In other words, government spending is the disease and deficits are basically a symptom of that underlying problem. Indeed, it’s worth noting that there’s not much evidence that deficits cause economic damage but plenty of evidence that bloated public sectors stunt growth. This video is a good antidote to CBO’s myopic focus on budget deficits.

There are two things that are worth noting.

First, every single answer is to the right of the Joint Committee on Taxation. The revenue-estimators on Capitol Hill assume that taxes have no impact on overall economic performance. As such, even confiscatory tax rates have very little impact on taxable income. The JCT operates in a totally non-transparent fashion, so it is difficult to know whether they would say the revenue-maximizing tax rate is 90 percent, 95 percent, or 100 percent, but it is remarkable that a mini-bureaucracy with so much power is so far out of the mainstream (it’s even more remarkable that Republicans controlled Congress for 12 years, yet never fixed this problem, but that’s a separate story).

Second, very few of the respondents made the critically important observation that it should not be the goal of tax policy to maximize revenue. After all, the revenue-maximizing point is where the damage to the overall economy is so great that taxable income falls enough to offset the impact of the higher tax rates. Greg Mankiw of Harvard and Steve Moore of the Wall Street Journal indicated they understood this point since they both explained that the long-run revenue-maximizing rate was lower than the short-run revenue-maximizing rate. But Martin Feldstein of Harvard explicitly addressed this issue and hit the nail on the head.

Why look for the rate that maximizes revenue? As the tax rate rises, the “deadweight loss” (real loss to the economy rises) so as the rate gets close to maximizing revenue the loss to the economy exceeds the gain in revenue…. I dislike budget deficits as much as anyone else. But would I really want to give up say $1 billion of GDP in order to reduce the deficit by $100 million? No. National income is a goal in itself. That is what drives consumption and our standard of living.

For more information, I think my three-part video series on the Laffer Curve is a good summary of the key issues. They’ve all been posted on Biggovernment.com at some point, but putting them in one post will be helpful for those who want to fully understand the issue. Part I addresses the theory, and explicitly notes that policy makers should target the growth-maximizing tax rate rather than the revenue-maximizing tax rate. Part II reviews some of the evidence, including analysis of the huge increase in taxable income and tax revenue from upper-income taxpayers following the Reagan tax-rate reductions. Part III looks at the Joint Committee on Taxation’s dismal performance.