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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UK to reconsider blood donation ban for men who have sex with men

Under current rules, men who have had sex with another man in the past twelve months cannot donate blood.

During Women and Equalities questions this morning, Jane Ellison MP slipped in a bombshell: men who have sex with other men may soon be able to donate blood. 

Ellision, who is Undersecretary of State for Public Health, said that Public Health England has carried out a new survey of blood donors which is currently being analysed. Next year, the Advisory Committee on the Safety of Blood Tissues and Organs (SaBTO), which sets blood donation guidelines, will use the evidence to review the current policy. 

She said:

Donor referrel for MSM [men who have sex with men] was changed from lifetime to 12 months referral in 2011. Four years later it is time again to look at this issue. Public Health England has conducted an anonymous survey of donors and I'm pleased that the advisory SaBTO will review this issue in 2016.

The current ban (which also applies to a range of other groups including sex workers) is based on the fact that MSM are at higher risk of contracting HIV, according to every Public Health England survey ever conducted on the disease. Both HIV and Hepatitis C don't show up in blood tests immediately, so the 12 month rule is based on leaving a "window" for the diseases to develop and be testable. The rules are ostensibly based on sexual activity, not on sexual orientation.

However, as Michael Fabricant pointed out in response to Ellison's announcement, in practice, it also looks a lot like discrimination - there is no ban on blood donation from straight people who have had unprotected sex, for example. Fabricant continued that "equality on this issue" is needed, and clinicians themselves feel a change is "long overdue".

Blood donations in the UK have fallen by 40 per cent in the last decade, a fact which may have contributed to the decision to review the current rules.

A Stonewall spokesperson said:

We’re delighted the Department of Health Minister Jane Ellison has announced this review.

We want a donation system that is fair and based on up-to-date medical evidence. Currently gay and bi people cannot give blood if they have had sex in the past 12 months,  regardless of whether they used protection. Yet straight people who may have had unprotected sex can donate. These current rules are clearly unfair and we want to see people asked similar questions - irrespective of their sexual orientation - to accurately assess the risk of infection. Screening all donors by sexual behaviour rather than by sexual orientation would increase blood stocks in times of shortage and create a safer supply by giving a more accurate, non-discriminatory assessment.

Barbara Speed is a technology and digital culture writer at the New Statesman and a staff writer at CityMetric.