Optimal tax rate for top one per cent may be as high as 83%

Paper suggests cutting taxes may divert attention to wasteful bargaining

Via Daniel Elton, a new(ish) paper (pdf) by economists Thomas Piketty, Emmanuel Saez and Stefanie Stantcheva makes the case for the optimal tax rate of the richest one per cent could be as high as 83 per cent.

The authors look at three possible ways in which top incomes respond to marginal tax rates.

The first is the "supply side" channel cited by Arthur Laffer when he developed his concept of the Laffer curve. Under this channel, marginal tax rates that are too high result in people doing less work than they otherwise would. Lower tax rates thus respond to more economic activity, and greater growth and higher tax revenue. Laffer's work was used by the Reagan administration to justify cutting the top rate in the US, from 70 per cent down to 28 per cent.

The second is the "tax avoidance" channel. This is the model cited by the Chancellor when he made the decision to cut the tax rate for top earners in Britain from 50 per cent to 45 per cent. The argument is that high tax rates increase tax avoidance, but the authors argue – in common with many of the Chancellors critics – that tax avoidance can be dealt with directly, writing that:

A better policy would be to first close loopholes so as to eliminate most tax avoidance opportunities and only then increase top tax rates.

The third is the "compensation bargaining" channel. The authors argue that:

While standard economic models assume that pay reflects productivity, there are strong reasons to be sceptical, especially at the top of the income distribution where the actual economic contribution of managers working in complex organisations is particularly difficult to measure.

As a result, top workers have ample opportunity to set their own pay, through bargaining harder or influencing compensation committees. The incentives for this economically wasteful activity are higher the lower tax rates are. Just as with the supply side model, tax cuts increase the wealth of the richest in society, but unlike that model they do not also increase growth; rather, the extra money for the rich comes from those poorer than them.

The authors, using their estimates of the elasticity of the various channels (that is, the magnitude of the effect), then calculate what the optimum rates would be. Under the first model, they find it to be roughly 57 per cent – 5 per cent higher than the top British tax rate is until the cut takes effect (National Insurance for top earners is 2per cent). Assessing the second model (Osborne's preferred argument), they find that the optimal tax rate would be 62 per cent, but argue that if the correct anti-avoidance and simplification measures were put in place, it would be 71 per cent.

The third model, however, outputs an optimal rate of 83 per cent. The authors still assume a minor supply-side effect, making up 40 per cent of the total elasticity, which is why it isn't higher. That is, they still assume that high tax rates will encourage the rich to work less, but they also assume that they will encourage the rich to put more of their effort into actual work, and less of it into "compensation bargaining".

How to decide between models one and three (the authors assume that once anti-avoidance measures are put in place, model two is the same as model one)? The former predicts that lower tax leads to more work, the latter that it merely leads to higher pay. As a result, tax cuts should be correlated with higher growth. Are they? Well, no:

As a result, the bargaining model can at least be said to be as realistic as the supply-side model; and if that's the case, the optimal top tax rate for most nations is likely to be far in excess of where it is set now.

For more, see the authors in the Boston Review, VoxEU, or their original paper (pdf).

Pictured: Laffer. No, wait, laughers. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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Four times Owen Smith has made sexist comments

The Labour MP for Pontypridd and Jeremy Corbyn’s Labour leadership rival has been accused of misogynist remarks. Again.

2016

Wanting to “smash” Theresa May “back on her heels”

During a speech at a campaign event, Owen Smith blithely deployed some aggressive imagery about attacking the new Prime Minister. In doing so, he included the tired sexist trope beloved of the right wing press about Theresa May’s shoes – her “kitten heels” have long been a fascination of certain tabloids:

“I’ll be honest with you, it pained me that we didn’t have the strength and the power and the vitality to smash her back on her heels and argue that these our values, these are our people, this is our language that they are seeking to steal.”

When called out on his comments by Sky’s Sophy Ridge, Smith doubled down:

“They love a bit of rhetoric, don’t they? We need a bit more robust rhetoric in our politics, I’m very much in favour of that. You’ll be getting that from me, and I absolutely stand by those comments. It’s rhetoric, of course. I don’t literally want to smash Theresa May back, just to be clear. I’m not advocating violence in any way, shape or form.”

Your mole dug around to see whether this is a common phrase, but all it could find was “set back on one’s heels”, which simply means to be shocked by something. Nothing to do with “smashing”, and anyway, Smith, or somebody on his team, should be aware that invoking May’s “heels” is lazy sexism at best, and calling on your party to “smash” a woman (particularly when you’ve been in trouble for comments about violence against women before – see below) is more than casual misogyny.

Arguing that misogyny in Labour didn’t exist before Jeremy Corbyn

Smith recently told BBC News that the party’s nastier side only appeared nine months ago:

“I think Jeremy should take a little more responsibility for what’s going on in the Labour party. After all, we didn’t have this sort of abuse and intolerance, misogyny, antisemitism in the Labour party before Jeremy Corbyn became the leader.”

Luckily for Smith, he had never experienced misogyny in his party until the moment it became politically useful to him… Or perhaps, not being the prime target, he simply wasn’t paying enough attention before then?

2015

Telling Leanne Wood she was only invited on TV because of her “gender”

Before a general election TV debate for ITV Wales last year, Smith was caught on camera telling the Plaid Cymru leader that she only appeared on Question Time because she is a woman:

Wood: “Have you ever done Question Time, Owen?”

Smith: “Nope, they keep putting you on instead.”

Wood: “I think with party balance there’d be other people they’d be putting on instead of you, wouldn’t they, rather than me?”

Smith: “I think it helps. I think your gender helps as well.”

Wood: “Yeah.”

2010

Comparing the Lib Dems’ experience of coalition to domestic violence

In a tasteless analogy, Smith wrote this for WalesHome in the first year of the Tory/Lib Dem coalition:

“The Lib Dem dowry of a maybe-referendum on AV [the alternative vote system] will seem neither adequate reward nor sufficient defence when the Tories confess their taste for domestic violence on our schools, hospitals and welfare provision.

“Surely, the Liberals will file for divorce as soon as the bruises start to show through the make-up?”

But never fear! He did eventually issue a non-apology for his offensive comments, with the classic use of “if”:

“I apologise if anyone has been offended by the metaphorical reference in this article, which I will now be editing. The reference was in a phrase describing today's Tory and Liberal cuts to domestic spending on schools and welfare as metaphorical ‘domestic violence’.”

***

A one-off sexist gaffe is bad enough in a wannabe future Labour leader. But your mole sniffs a worrying pattern in this list that suggests Smith doesn’t have a huge amount of respect for women, when it comes to political rhetoric at least. And it won’t do him any electoral favours either – it makes his condemnation of Corbynite nastiness ring rather hollow.

I'm a mole, innit.