Yet again, the UK government has sided with the robotraders on a Robin Hood Tax

A financial transactions tax is the most economically efficient way to lessen the harm of HFT – but the government keeps fighting it.

Fifteen years ago the computer program Deep Blue made headlines around the world by beating chess giant Garry Kasparov. In the years since, computer algorithms have quietly gone on to dominate large parts of the financial markets.

Computer-driven trading now accounts for 70 per cent of trading in the US equity market, 36 per cent in the UK. Machines fire tens of thousands of trades a second, relying on state-of-the art technology and proximity to stock exchanges to shave microseconds off transaction times.

Yet tiny errors in the algorithms can have devastating consequences. During the infamous 'Flash Crash' of 2010 the Dow Jones index dropped nine per cent in a matter of minutes. Over the summer Knight Capital – a leading New York HFT (high frequency trading) firm – erroneously swamped the stock market with errant trades, wiping $440m from the firm's value.

That's why the European Parliament's powerful Economic Affairs Committee this week voted through legislation – the Markets in Financial Instruments Directive II – designed to curb HFT. A key proposal being that trades will have to be posted for at least 500 milliseconds (currently traders can execute 10,000 trades during the same period).

Proponents of HFT argue their churning sea of trades brings liquidity to the markets. The reality is more capricious - in times of crisis traders pull the plug, draining liquidity when it is needed most.

Adair Turner described such corners of financial markets as "socially useless". The Financial Times recently said “hard evidence and common sense point to a host of social benefits from removing unnecessary intermediation and curbing predatory trading strategies”, adding that in some areas Mifid II was simply too mild.

It's no surprise that high frequency traders themselves have mounted a defence against the reforms. What's of more concern is that in the days preceding the vote the UK Government lobbied for them to be watered-down. Its official response did not support the call for HFT firms to hold equities for a minimum period.

Yet as the Bureau for Investigative Journalism revealed last week, of a 31-member panel tasked by the UK Government to assess Mifid II, 22 members were from the financial services, 16 linked to the HFT industry. A study by the Bureau last year revealed that over half the funding for the Conservative Party came from the financial sector, 27 per cent coming from hedge funds, financiers and private equity firms. This perhaps helps explain how the interests of a select group of traders get confused with the interests of the economy as a whole.

It's a similar story for the Financial Transaction Tax. No longer a pipe dream, European Governments of all political hues, including its largest economies, are working towards its implementation by next year. The tax of between 0.1 - 0.01 per cent on financial transactions offers a more effective mechanism to limit market excesses by making certain speculative trades less profitable. But crucially, it is also capable of raising billions in much needed revenue that would ensure the financial sector pays it fair share for the damage caused to our economy.

Yet the UK Government has again chosen to stand apart in blocking a Europe wide-FTT, turning down billions in desperately needed revenue that could help save jobs, protect the poorest and avoid the worst in cuts to public services. Instead, advice of previous Party Treasurers Michael Spencer and Peter Cruddas was heeded, who infamously lobbied against the FTT. Both incidentally own multi-million pound financial firms which would be hit by such a tax.

Taken together, this tells the story of a post-financial crisis Europe: as governments embark on the arduous task of making markets once again work in the interests of society, the UK Government remains intoxicated by the Square Mile - protecting vested interests and relying on the same market principles that got us into this mess to get us out again. Best brace ourselves for a bumpy ride.

The EU Parliament. Photograph: Getty Images

Simon Chouffot is a spokesperson for the Robin Hood Tax campaign and writes on the role of the financial sector in our society.

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Jeremy Corbyn will stay on the Labour leadership ballot paper, judge rules

Labour donor Michael Foster had challenged the decision at the High Court.

The High Court has ruled that Jeremy Corbyn should be allowed to automatically run again for Labour leader after the decision of the party's National Executive Committee was challenged. 

Corbyn declared it a "waste of time" and an attempt to overturn the right of Labour members to choose their leader.

The decision ends the hope of some anti-Corbyn Labour members that he could be excluded from the contest altogether.

The legal challenge had been brought by Michael Foster, a Labour donor and former parliamentary candidate, who maintained he was simply seeking the views of experts.

But when the experts spoke, it was in Corbyn's favour. 

The ruling said: "Accordingly, the Judge accepted that the decision of the NEC was correct and that Mr Corbyn was entitled to be a candidate in the forthcoming election without the need for nominations."

This judgement was "wholly unaffected by political considerations", it added. 

Corbyn said: "I welcome the decision by the High Court to respect the democracy of the Labour Party.

"This has been a waste of time and resources when our party should be focused on holding the government to account.

"There should have been no question of the right of half a million Labour party members to choose their own leader being overturned. If anything, the aim should be to expand the number of voters in this election. I hope all candidates and supporters will reject any attempt to prolong this process, and that we can now proceed with the election in a comradely and respectful manner."

Iain McNicol, general secretary of the Labour Party, said: “We are delighted that the Court has upheld the authority and decision of the National Executive Committee of the Labour Party. 

“We will continue with the leadership election as agreed by the NEC."

If Corbyn had been excluded, he would have had to seek the nomination of 51 MPs, which would have been difficult since just 40 voted against the no confidence motion in him. He would therefore have been effectively excluded from running. 

Owen Smith, the candidate backed by rebel MPs, told the BBC earlier he believed Corbyn should stay on the ballot paper. 

He said after the judgement: “I’m pleased the court has done the right thing and ruled that Jeremy should be on the ballot. This now puts to bed any questions about the process, so we can get on with discussing the issues that really matter."

The news was greeted with celebration by Corbyn supporters.