Any chance of a link to this study?
http://ec.europa.eu/taxation_customs/resources/documents/taxation/other_taxes/financial_sector/impact_assessment.zip
You'll find it more comprehensive then your evidence of, "look around you," earlier on in the thread. p50 confirms the decline in GDP as a result. p33 confirms the yield. Combine the two and you'll find that total tax revenues fall as a result. You may also like to consult the following:
Diamond, P. A. and J. A. Mirrlees (1971) ‘Optimal Taxation and Public Production II: Tax Rules’, American Economic Review[FONT=Arial,Arial][FONT=Arial,Arial], 61, 3, 261-78.[/FONT][/FONT]
I'm sure you remember Wilson's aphorism that "a week is a long time in politics." On that basis 20 years sounds like more than a life time.I'm also reminded of a remark by Keynes that he preferred the short term and the medium term since "in the long term we're all dead".
Keynes actually said, "in the long run, we are all dead." Nevermind though. You'll also note that this is about economics, not politics. The nature of a FTT would mean that GDP is likely to decline more than the 20 year average in the first couple of years, mainly because it would eliminate a number of low margin activities (which is the point of it I assume from those wanting to introduce it). The 20 year average is therefore a better measure of whether it is economically viable. You also didn't respond to my comments on tax incidence.
Why do you want to introduce a tax that will financially impact the users of financial services rather than the banks? Why is the left so obsessed with symbolic gestures, even where the outcome disadvantages the people they claim to help? Is it because ultimately their policies and ideas have been shown not to work and so instead they convince themselves that only good intentions matter?