Dynamic Scoring

Debunking the Debunking of Dynamic Scoring and the Laffer Curve

Many statists are worried that Republicans may install new leadership at the Joint Committee on Taxation (JCT) and Congressional Budget Office (CBO).

This is a big issue because these two score-keeping bureaucracies on Capitol Hill tilt to the left and have a lot of power over fiscal policy.

The JCT produces revenue estimates for tax bills, yet all their numbers are based on the naive assumption that tax policy generally has no impact on overall economic performance. Meanwhile, CBO produces both estimates for spending bills and also fiscal commentary and analysis, much of it based on the Keynesian assumption that government spending boosts economic growth.

I personally have doubts whether congressional Republicans are smart enough to make wise personnel choices, but I hope I’m wrong.

Matt Yglesias of Vox also seems pessimistic, but for the opposite reason.

He has a column criticizing Republicans for wanting to push their policies by using “magic math” and he specifically seeks to debunk the notion - sometimes referred to as dynamic scoring or the Laffer Curve - that changes in tax policy may lead to changes in economic performance that affect economic performance.

He asks nine questions and then provides his version of the right answers. Let’s analyze those answers and see which of his points have merit and which ones fall flat.

But even before we get to his first question, I can’t resist pointing out that he calls dynamic scoring “an accounting gimmick from the 1970s” in his introduction. That is somewhat odd since the JCT and CBO were both completely controlled by Democrats at the time and there was zero effort to do anything other than static scoring.

I suppose Yglesias actually means that dynamic scoring first became an issue in the 1970s as Ronald Reagan (along with Jack Kemp and a few other lawmakers) began to argue that lower marginal tax rates would generate some revenue feedback because of improved incentives to work, save, and invest.

Now let’s look at his nine questions and see if we can debunk his debunking:

Progress on the Laffer Curve*

The title of this piece has an asterisk because, unfortunately, we’re not talking about progress on the Laffer Curve in the United States.

Instead, we’re discussing today how lawmakers in other nations are beginning to recognize that it’s absurdly inaccurate to predict the revenue impact of changes in tax rates without also trying to measure what happens to taxable income (if you want a short tutorial on the Laffer Curve, click here).

But I’m a firm believer that policies in other nations (for better or worse) are a very persuasive form of real-world evidence. Simply stated, if you’re trying to convince a politician that a certain policy is worth pursuing, you’ll have a much greater chance of success if you can point to tangible examples of how it has been successful.

That’s why I cite Hong Kong and Singapore as examples of why free markets and small government are the best recipe for prosperity. It’s also why I use nations such as New Zealand, Canada, and Estonia when arguing for a lower burden of government spending.

And it’s why I’m quite encouraged that even the squishy Tory-Liberal coalition government in the United Kingdom has begun to acknowledge that the Laffer Curve should be part of the analysis when making major changes in taxation.

UK Laffer CurveI don’t know whether that’s because they learned a lesson from the disastrous failure of Gordon Brown’s class-warfare tax hike, or whether they feel they should do something good to compensate for bad tax policies they’re pursuing in other areas, but I’m not going to quibble when politicians finally begin to move in the right direction.


The Wall Street Journal opines that this is a very worthwhile development.

Chancellor of the Exchequer George Osborne has cut Britain’s corporate tax rate to 22% from 28% since taking office in 2010, with a further cut to 20% due in 2015. On paper, these tax cuts were predicted to “cost” Her Majesty’s Treasury some £7.8 billion a year when fully phased in. But Mr. Osborne asked his department to figure out how much additional revenue would be generated by the higher investment, wages and productivity made possible by leaving that money in private hands.

By the way, I can’t resist a bit of nit-picking at this point. The increases in investment, wages, and productivity all occur because the marginal corporate tax rate is reduced, not because more money is in private hands.

I’m all in favor of leaving more money in private hands, but you get more growth when you change relative prices to make productive behavior more rewarding. And this happens when you reduce the tax code’s penalty on work compared to leisure and when you lower the tax on saving and investment compared to consumption.

The Reagan Tax Cuts, Budget Forecasting, and Government Revenue

While perusing the Internet, I saw an article by Iwan Morgan, who is the author of The Age of Deficits: Presidents and unbalanced Budgets from Jimmy Carter to George W. Bush. The author asserted in this article that, “The deficit explosion on his watch was a nasty surprise for Ronald Reagan not a deliberate strategy to reduce government.  In his rosy interpretation of Laffer curve theory, the personal tax cuts he promoted in 1981 would deliver higher not lower revenues through their boost to economic growth.”

The Laffer Curve Strikes Again

In the private sector, no business owner would be dumb enough to assume that higher prices automatically translate into proportionately higher revenues. If McDonald’s boosted hamburger prices by 30 percent, for instance, the experts at the company would fully expect that sales would decline. Depending on the magnitude of the drop, total revenue might still climb, but by far less than 30 percent. And it’s quite possible that the company would lose revenue. In the public sector, however, there is very little understanding of how the real world works.

Obamacare Will Be a Budget Buster

Does anyone think that a huge new entitlement program will lead to lower budget deficits? Sounds implausible, yet proponents of government-run healthcare claim this is the case according to the official estimates from the Congressional Budget Office and Joint Committee on Taxation.

To use a technical phrase, this is hogwash. This new 6-1/2 minute video, narrated by yours truly, gives 12 reasons why Obamacare will lead to higher deficits - including real-world evidence showing how Medicare and Medicaid are much more costly than originally projected.

Subscribe to RSS - Dynamic Scoring