It's nice to see a media storm staying in its teacup, for once

Boeing's shares go up, in spite of everything.

The 787 Dreamliner battery problems have been an ongoing background drone amid the business news for some time, but it looks like the coverage hasn't affected the share price. In fact Boeing shares rose 12 per cent this year.

This could be because Boeing's main business is not the 787, but the 737 - narrower crafts of which they'll deliver 900 in the next two years (as opposed to 200 787s), and of which there are rumors of a $18bn deal this week with Ryanair. Boeing's 2011 to 2014 shipments are also expected to grow an average 15 per cent annually. So if you're a sensible investor, you won't have paid much attention to all the battery stuff.

Still, the usual consensus is that media coverage affects share price far more than it should - not because investors are too gullible, but because they think other investors are. This even extends to twitter/facebook/youtube - at least according to this recent study by Arthur O’Connor, which seems to suggest a clear link between share price and positive social media mentions. (This hedge fund is trying to get in on the act by offering investors "mood analysis" of twitter, which they translate to the stock market. They do this in a fairly crude manner - looking at the frequency of words such as "calm" in relation with certain stocks - but it's an interesting idea.)

Boeing investors are either very strong minded, or haven't been keeping up with the news. Either way, it's refreshing.

A 787 Dreamliner. Photograph: Getty Images
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PMQs review: Jeremy Corbyn turns "the nasty party" back on Theresa May

The Labour leader exploited Conservative splits over disability benefits.

It didn't take long for Theresa May to herald the Conservatives' Copeland by-election victory at PMQs (and one couldn't blame her). But Jeremy Corbyn swiftly brought her down to earth. The Labour leader denounced the government for "sneaking out" its decision to overrule a court judgement calling for Personal Independence Payments (PIPs) to be extended to those with severe mental health problems.

Rather than merely expressing his own outrage, Corbyn drew on that of others. He smartly quoted Tory backbencher Heidi Allen, one of the tax credit rebels, who has called on May to "think agan" and "honour" the court's rulings. The Prime Minister protested that the government was merely returning PIPs to their "original intention" and was already spending more than ever on those with mental health conditions. But Corbyn had more ammunition, denouncing Conservative policy chair George Freeman for his suggestion that those "taking pills" for anxiety aren't "really disabled". After May branded Labour "the nasty party" in her conference speech, Corbyn suggested that the Tories were once again worthy of her epithet.

May emphasised that Freeman had apologised and, as so often, warned that the "extra support" promised by Labour would be impossible without the "strong economy" guaranteed by the Conservatives. "The one thing we know about Labour is that they would bankrupt Britain," she declared. Unlike on previous occasions, Corbyn had a ready riposte, reminding the Tories that they had increased the national debt by more than every previous Labour government.

But May saved her jibe of choice for the end, recalling shadow cabinet minister Cat Smith's assertion that the Copeland result was an "incredible achivement" for her party. "I think that word actually sums up the Right Honourable Gentleman's leadership. In-cred-ible," May concluded, with a rather surreal Thatcher-esque flourish.

Yet many economists and EU experts say the same of her Brexit plan. Having repeatedly hailed the UK's "strong economy" (which has so far proved resilient), May had better hope that single market withdrawal does not wreck it. But on Brexit, as on disability benefits, it is Conservative rebels, not Corbyn, who will determine her fate.

George Eaton is political editor of the New Statesman.