"Fiscal cliff" could knock 6.5% off America's Q1 and Q2 annualised growth

"Taxmaggedon" would hit in January

The American Congressional Budget Office (the inspiration for our own Office of Budget Responsibility) has released a report warning that the impact of the upcoming "fiscal cliff" would be to wipe 4 per cent from GDP growth for 2013.

The fiscal cliff – a phrase coined by federal reserve chairman Ben Bernanke – is the result of a series of several major budget provisions all expiring at once, at the same time as some of the automatic cuts negotiated as part of the debt ceiling crisis last summer come into effect, and several tax cuts time out. More broadly, though, it is the result of America's frankly broken political system.

In March, Congress failed to pass two potential measures which would have ended the crisis:

The first, a bipartisan bill which has the most chance of passing in the Democrat-controlled Senate, was defeated 382-38; the second, the White House's preferred option, was unanimously rejected 414 to 0.

If something is not passed by the time the various provisions expire, on 31 December, then the CBO estimates that:

Those policies will reduce the federal budget deficit by $607 billion, or 4.0 percent of gross domestic product (GDP), between fiscal years 2012 and 2013. The resulting weakening of the economy will lower taxable incomes and raise unemployment, generating a reduction in tax revenues and an increase in spending on such items as unemployment insurance. With that economic feedback incorporated, the deficit will drop by $560 billion between fiscal years 2012 and 2013, CBO projects.

If all the fiscal blows are deflected, the economy should grow by 5.3 per cent (annualised) in the first half of next year. If they aren't, it will instead contract by 1.3 per cent.

The coming showdown has been compared by many to the debt ceiling crisis, when Congress hit deadlock last summer over a budgetary provision which would have caused America to default on its debt, but in many ways, it is more dangerous still. The debt ceiling itself will reenter the political battleground in spring of 2013, and the Republican leader John Boehner is signalling that he will play hardball over the issue. Then there's the fact that the deal will be happening shortly after the presidential election so there is no incentive for dealmaking to start until November; both parties' incentives will differ greatly depending on who will be inheriting the mess.

Related, Joe Weisenthal suggests the most apocalyptic scenario possible:

It's very easy to imagine Romney winning the popular vote and Barack Obama winning the electoral college. In fact, the electoral college map is VERY favorable to Obama. This scenario is definitely possible and it would be the fiscal cliff Black Swan.

If you thought Congressional Republicans were going to be intransigent on the debt ceiling, multiply that by 10x. Any goodwill would be dead as the Republicans would feel a mandate based on the desires of the majority of the people, and Obama would be weak.

It would be NUTS!

Republican Speaker John Boehner. 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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To stop Jeremy Corbyn, I am giving my second preference to Andy Burnham

The big question is whether Andy Burnham or Yvette Cooper will face Jeremy in the final round of this election.

Voting is now underway in the Labour leadership election. There can be no doubt that Jeremy Corbyn is the frontrunner, but the race isn't over yet.

I know from conversations across the country that many voters still haven't made up their mind.

Some are drawn to Jeremy's promises of a new Jerusalem and endless spending, but worried that these endless promises, with no credibility, will only serve to lose us the next general election.

Others are certain that a Jeremy victory is really a win for Cameron and Osborne, but don't know who is the best alternative to vote for.

I am supporting Liz Kendall and will give her my first preference. But polling data is brutally clear: the big question is whether Andy Burnham or Yvette Cooper will face Jeremy in the final round of this election.

Andy can win. He can draw together support from across the party, motivated by his history of loyalty to the Labour movement, his passionate appeal for unity in fighting the Tories, and the findings of every poll of the general public in this campaign that he is best placed candidate to win the next general election.

Yvette, in contrast, would lose to Jeremy Corbyn and lose heavily. Evidence from data collected by all the campaigns – except (apparently) Yvette's own – shows this. All publicly available polling shows the same. If Andy drops out of the race, a large part of the broad coalition he attracts will vote for Jeremy. If Yvette is knocked out, her support firmly swings behind Andy.

We will all have our views about the different candidates, but the real choice for our country is between a Labour government and the ongoing rightwing agenda of the Tories.

I am in politics to make a real difference to the lives of my constituents. We are all in the Labour movement to get behind the beliefs that unite all in our party.

In the crucial choice we are making right now, I have no doubt that a vote for Jeremy would be the wrong choice – throwing away the next election, and with it hope for the next decade.

A vote for Yvette gets the same result – her defeat by Jeremy, and Jeremy's defeat to Cameron and Osborne.

In the crucial choice between Yvette and Andy, Andy will get my second preference so we can have the best hope of keeping the fight for our party alive, and the best hope for the future of our country too.

Tom Blenkinsop is the Labour MP for Middlesbrough South and East Cleveland