I think the argument over the Laffer curve is about where we are on the curve and what the elasticity is at that point. Hopefully no one including Reagan's first chief economic adviser believes people produce full speed as tax rates approach 100% or that taxes have no effect on production.
Take one example, the federal capital gains rate max is pretty low at 15% - for 21 more days. If that were the only tax on capital gains (ignoring that state tax, federal corp tax, state corp tax and the inflation tax) lowering the rate might not increase revenues - from that tax. Some Republican candidates wanted capital gains tax rates droped to zero. That may bring in revenue from other taxes by spurring other activities like hiring and plant expansions, but 0% doesn't bring in more revenue - from that tax. My problem isn't the 15% tax or that 20% total would be too high, but that states tax capital gains as ordinary income. As the combined tax rate goes up, the number of people choosing to incur the tax goes down. What the revenues will do depends on the shape of the curve and where you are on it. Does that make sense?
An aside for a story attempting analogy: My old boss in the export business (a less famous former Prof of mine) used to explain to our manufacturers the following regarding product price strategy. He drew his own 'Laffer curve' and said that there is a perfect or optimum price for the product that maximizes revenues and profits and we can't know precisely what that perfect or optimum price is. If we set the price too high, we incur (and waste) all of the same marketing and sales costs but lose sales and miss out on these revenues. If we set the price too low, we have left money on the table, people were willing to pay more, but we bought market share and gained customers with our error. The strategy is to set the price as close as possible to the unknown optimum price without going above it. Same I think applies to taxation, though we have made it enormously and unnecessarily complex. We have all these costs of governing that we need to cover whether people produce or not. Some workers with fixed pay and fixed hours have no elasticity in production - no choice to work more, less, faster or smarter in response to whatever government or their employer throws at them. The rich most certainly do have options, as demonstrated in the UK story. That doesn't mean we should tax the rich lower or the same as paycheck to paycheck working people, but it means we need to be more aware of the likely responses to our policies as we design them. In general, the lower the marginal tax rate, the less incentive one has to change behavior to avoid the tax.
Dems like Obama think (or say) a 36% federal tax rate (plus 9-10% state in some cases) is no hindrance to productive activity and that bumping that up to 44.6% (+12.3 Calif) plus embedded tax, corporate taxes, etc is still no hindrance. Simple arithmetic will calculate the increase or decrease in revenue. They are wrong. (An admittedly close minded statement!) Bush's 1.6 or 3.9 trillion dollar tax cuts claim is a lie or amazingly naive untruth. Federal revenues grew by 44% in 4 years when they were fully implemented. Who knew? (Not the readers of the NYT front page or lead editorials. Not the viewers of CBS network news.) It was a percentage rate cut, but not a tax cut at all. It was a tax increase on the rich if we are measuring taxes in dollars.
The honest question or argument is
how much will people in the aggregate, not one author, change their productive behavior, not
whether the will make adjustments. If people don't change behavior to different circumstances, what is the point of studying economics?
The amount of change people make seems to always surpass expectations. That means the expectations were wrong, not the change. The change documented in the U.K. is phenomenal, even the part that was from frontloading.
"This discussion began on the media forum with a post about how 6000 millionaires had left the UK."
You mean 10,000 'left' and 6,000 stayed. The data tells a story that is true. 10,000 left that income bracket comparing one year to the previous. Some of the coverage of the data had statements that were false, saying or implying people physically left the U.K.
The so-called forestalling of the income implies the data exaggerates the phenomenon, but it is still part of the evidence that the rich have an amazing ability to make adjustments to their income producing behavior in response to different marginal tax rates. Timing of a taxable event is only one of the adjustments they make. As Crafty noted, we don't know that all those elective tax events, sale of an asset would have just happened later anyway, no matter the tax rate. It doesn't all come back because that wasn't the only thing going on. The UK became a worse place to make a productive investment. Regarding forestall, the velocity of these transactions, moving consumption, investment, hiring, construction and revenues forward (velocity of money) is crucial to revenues and economic well being. High tax rates slow things down. So do excessive regulations. So does uncertainty. When you slow things down, your income, tax revenues (and hiring) are all lower in any given period than they would otherwise be.
To doctors they say do no harm. Taxes do harm; tax something and you get less of it. One point of tax policy is to do as little harm as possible to raise the needed revenues. Our current strategy is the opposite. Do maximum harm and raise no new revenues.
The forestalling phenomenon supports my argument about the financial crash of 2008. People make investment and hiring decisions decisions today based on what they see coming tomorrow. The economy, especially employment, peaked around the Nov 2006 to Jan 2007 timeframe when Pelosi-Reid-Obama-Hillary-Biden-Keith Ellison and company were elected and sworn in to take the majority in congress. George Bush had two years left in office (divided government) and so did the tax rate cuts. By the fall of 2008, triggered by failed government intervention in housing, investors could see it was time to sell and capture any remaining gains and put money on the sidelines in the face of higher tax rates, a slowing economy and rapidly increasing excesses in regulations. The higher tax rates kept getting delayed but were always in plain view as tomorrow's tax rate on today's investment. The onslaught of new regulations with even more on the way (Obamacare!) were taxes in themselves.
Back to the U.K., one question would be - what revenue projections did their CBO (PBO?) make to foster the passing of these failed tax rate increases. Why do these 'experts' keep getting it wrong? How does it help in the US to keep information from the voters just because thoughtful analysis will be required to fully understand the implications. For whatever it means, the number of returns in the top bracket dropped 60% in one year precisely at the time of a significant tax rate hike. Revenues didn't rise less than expected year to year on the top bracket - they fell! Can we use that strategy again, forestall income every year by raising the rates for the next year, again and again? What could possibly go wrong with that? See the Laffer curve for the answer. Revenues approach zero as tax rates percentages approach 100.
Bigdog, my famous Prof name dropping from the big public university starts and ends with Heller, and it was Schlesinger who brought him up. I like to call one Supreme Court Justice Crafty's old Prof, (yours too perhaps). As a hockey player I'll take the assist for setting you up for the ex-President story. If it was ex President Hayes, Garfield or Benjamin Harrison who made the beard comment I will be all the more impressed.
"I too could paste graphs and tables and arguments. These would include many from peer reviewed economics journals that would take your posts to task. We both know, however, that no matter the evidence that I post, minds are not changed."
Of course close mindedness is a problem, but all people here still want to have a better informed minds! Please post as time permits. I did not intend to overwhelm with so many charts telling roughly the same story. Just take the first one for example, re-posted below. What do you have, peer reviewed, that refutes this, that the rich pay more - in dollars or share of dollars of revenues to the Treasury, not percent of a diminished GDP - when the top marginal tax rate is lower? Looking forward to it.