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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What is the EU customs union and will Brexit make us leave?

International trade secretary Liam Fox's job makes more sense if we leave the customs union. 

Brexiteers and Remoaners alike have spent the winter months talking of leaving the "customs union", and how this should be weighed up against the benefits of controlling immigration. But what does it actually mean, and how is it different from the EU single market?

Imagine a medieval town, with a busy marketplace where traders are buying and selling wares. Now imagine that the town is also protected by a city wall, with guards ready to slap charges on any outside traders who want to come in. That's how the customs union works.  

In essence, a customs union is an agreement between countries not to impose tariffs on imports from within the club, and at the same time impose common tariffs on goods coming in from outsiders. In other words, the countries decide to trade collectively with each other, and bargain collectively with everyone else. 

The EU isn't the only customs union, or even the first in Europe. In the 19th century, German-speaking states organised the Zollverein, or German Customs Union, which in turn paved the way for the unification of Germany. Other customs unions today include the Eurasian Economic Union of central Asian states and Russia. The EU also has a customs union with Turkey.

What is special about the EU customs union is the level of co-operation, with member states sharing commercial policies, and the size. So how would leaving it affect the UK post-Brexit?

The EU customs union in practice

The EU, acting on behalf of the UK and other member states, has negotiated trade deals with countries around the world which take years to complete. The EU is still mired in talks to try to pull off the controversial Transatlantic Trade and Investment Partnership (TTIP) with the US, and a similar EU-Japan trade deal. These two deals alone would cover a third of all EU trade.

The point of these deals is to make it easier for the EU's exporters to sell abroad, keep imports relatively cheap and at the same time protect the member states' own businesses and consumers as much as possible. 

The rules of the customs union require member states to let the EU negotiate on their behalf, rather than trying to cut their own deals. In theory, if the UK walks away from the customs union, we walk away from all these trade deals, but we also get a chance to strike our own. 

What are the UK's options?

The UK could perhaps come to an agreement with the EU where it continues to remain inside the customs union. But some analysts believe that door has already shut. 

One of Theresa May’s first acts as Prime Minister was to appoint Liam Fox, the Brexiteer, as the secretary of state for international trade. Why would she appoint him, so the logic goes, if there were no international trade deals to talk about? And Fox can only do this if the UK is outside the customs union. 

(Conversely, former Lib Dem leader Nick Clegg argues May will realise the customs union is too valuable and Fox will be gone within two years).

Fox has himself said the UK should leave the customs union but later seemed to backtrack, saying it is "important to have continuity in trade".

If the UK does leave the customs union, it will have the freedom to negotiate, but will it fare better or worse than the EU bloc?

On the one hand, the UK, as a single voice, can make speedy decisions, whereas the EU has a lengthy consultative process (the Belgian region of Wallonia recently blocked the entire EU-Canada trade deal). Incoming US President Donald Trump has already said he will try to come to a deal quickly

On the other, the UK economy is far smaller, and trade negotiators may discover they have far less leverage acting alone. 

Unintended consequences

There is also the question of the UK’s membership of the World Trade Organisation, which is currently governed by its membership of the customs union. According to the Institute for Government: “Many countries will want to be clear about the UK’s membership of the WTO before they open negotiations.”

And then there is the question of policing trade outside of the customs union. For example, if it was significantly cheaper to import goods from China into Ireland, a customs union member, than Northern Ireland, a smuggling network might emerge.

 

Julia Rampen is the editor of The Staggers, The New Statesman's online rolling politics blog. She was previously deputy editor at Mirror Money Online and has worked as a financial journalist for several trade magazines.