"Seventeen of the 35 chairmen or chief executives who signed yesterday's letter were among the businessmen who endorsed a similar round-robin before the May election backing Tory plans to reverse Labour's proposal to raise national insurance contributions by 1 per cent. Mr Osborne later cancelled it for employers but retained it for employees."

"Prominent Tory donors among business leaders who backed Osborne's cuts"

It's called 'quid pro quo', or as an old conman of my acquaintance used to say, "You've got to speculate to accumulate".