We would be better served by a regressivetaxrate, that would become progressively smaller the longer the investment is held.
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2.
In the UK, given the tax system, this would mean increasing VAT (a nice regressivetax) and then, say, abolishing the 50 p additional taxrate on higher earners.
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3.
BBC, the harder it becomes to justify the flat-rate licence fee (in all but name, a regressivetax) levied on all the country's television owners to pay for the corporation.