Interestinnnng....Mostly explained by the Laffer Curve - apart from the problem that it's impossible to know what the curve looks like or where the peak is.
I recall reading an excellent explanation many years ago, by way of a metaphor.
A group of 10 friends would meet up and go out for dinner on a regular basis. At the end, they'd split the bill - one paid a lot more because he was quite wealthy and could afford it, a couple paid nothing as they were very poor and the others covered their share of the bill, and the others paid various amounts based on their disposable income. Because they were regulars, the restaurateur decided to offer them a discount - which caused arguments over who would get what share of the rebate. The end result was that the person who was effectively paying for 3 or 4 meals decided he'd had enough and decided not to join them the next week - and thats' when the other 9 found they no longer had enough money to pay the bill.
The Laffer curve was popularized in the United States with policymakers following an afternoon meeting with Ford Administration officials Dick Cheney and Donald Rumsfeld in 1974, in which Arthur Laffer reportedly sketched the curve on a napkin to illustrate his argument. The term "Laffer curve" was coined by Jude Wanniski, who was also present at the meeting. The basic concept was not new; Laffer himself notes antecedents in the writings of the 14th-century social philosopher Ibn Khaldun and others.
After the second Iraq war and the subsequent financial crash i imagine many of 'em weren't laffin' then.
