I didn’t have time to respond, but the IPA brought Arthur Laffer out to Australia a month or two ago. For those interested, over the fold is a relevant extract from Zombie Economics.
Of rather more concern is the evidence that both the Secretary of the Treasury, John Fraser, and his Deputy for Revenue, Rob Heferen are adherents of the Laffer hypothesis or something very close to it. Fraser gave evidence to the Senate endorsing the Reagan tax cuts (based on Laffer’s hypothesis), while Heferen has claimed that something like 50 per cent of the revenue lost through a company tax cut will be returned through dynamic effects.
Although no issues are ever truly resolved in economics, this informal survey published by Ezra Klein is revealing. Klein asked various people about the tax rate at which revenue would be maximized. His respondents fell into three groups: left/liberal economists, who mostly gave answers around 70 per cent, rightwing pundits with zero credibility who gave answers around 20 per cent, and serious right/centre-right economists, who declined to give a direct answer to the question.
This suggests to me that the debate over the Laffer hypothesis has been won fairly conclusively by the left, and that those on the right would prefer to frame the question in the more defensible (though still, in my opinion, incorrect) claim that we face a long-run trade-off between equality and growth.