Question for @SWP's back and others. Is this wealth flight in response to taxes supported by research? To what degree? Any usable metrics for it?
It's the same logic used by austerity. I have a similar problem with both.
I cannot for the life of me understand how the Government reducing investment is going to make others want to invest in the private sector. That's mental. If the Government aren't investing then they don't have faith in their economy and if the guys running it don't have faith then why should I?
Yes, there's tons of research on this, the Laffer Curve is the shorthand for it. This one is nicely balanced when talking about some of our recent changes: https://fullfact.org/economy/did-higher-taxes-lead-reduced-revenue-rich/
Equally, the cut of the top rate from 50p to 45p certainly didn't have a negative effect, even if the amount raised is open to debate. https://fullfact.org/economy/did-cutting-50p-rate-tax-raise-8-billion/
What makes it difficult to assess completely is that tax cuts tend to happen when an economy is doing well, so you'd expect the revenue raised to be higher then anyway, and that is why when some point to examples as being self-evidently the case, it's not as simple as that. What I would say is the small differentials around our 45% top rate suggests that we're pretty much at the optimal level for the tax take, and there's not that much advantage in either raising or lowering it.
On the second part of your question, businesses invest more if they have more to invest, i.e. if the government takes less money off them. The worst kind of taxation isn't corporation tax, it's things like employers' national insurance - it's quite literally a tax on job creation.
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