inputs: hypothesis: Alistair Darling is chancellor. premise: Alistair Darling will not raise the amount of cash he wants from the new 50p income tax rate because high earners will find ways to avoid paying it, experts say. The Chancellor revealed in his Budget that borrowing this year would soar to a record £175bn as the government tries to "grow" its way out of recession. Mr Darling confirmed that the UK was in the grip of the deepest slump since the Second World War, with the economy set to shrink by 3.5% in 2009 - more than double his previous forecast.