Help.

Would someone please explain to me how a 50% tax rate on earnings over £150K stops investment? Surely the money used to pay someone enough to trigger the tax is being taken out of the company so can't be used for investment because it has been paid out to the Directors rather than being re-invested in the infrastructure of the business or spent on business development.
Can anyone with more education than I have please enlighten me?

Oh and while we're on can someone also explain why privatising the Police is a good thing?

Thanks