Six billion out of the economy?

Why does not Cameron ask the simple questions?

"Mr Brown, Gordon, please explain: how does not taxing business by an extra six-billion pounds take money OUT of the economy?"

"How does taxing British business ever put money INTO the economy?"

"Is not the justification for taxation that there are some things that need to be done and the state does best? And that does not really apply to wasting money?"

"So why persist with the NI tax if waste can be cut?"

He could even have admitted that he'd have to raise the tax if he failed to identify the waste.

But, why raise intelligent arguments when you could use the words "job-tax" every other sentence.