Do idiots like Bill Nighy have any idea what damage a 0.05% tax on every foreign exchange transaction would have to the global economy?
Take the EUR/USD exchange rate, its quoted 2 pips wide (so 1.3940/1.3942 say) or 0.014% wide. A 0.05% tax is going to mean the bid/offer would have to widen to 16 pips (1.3932/1.3948). It would widen the bid/offer by 8 times!
Liquidity in FX market would fall and in reality bid/offer would widen even more. Who would pay the additional bid/offer? Every import/export business. Now how would they pay for that additional cost?
Robin Hood's stated aims are to reduce poverty in the UK and developing countries. Putting taxes on FX transactions would seriously damage things like the global food trade. Are they naive enough to think that banks or corporations aren't just going to pass the charges on?
Businesses will raise prices in the country they import to. This raises the cost of living, making everybody poorer. Businesses will reduce the price they pay for good in the exporting country. What would that do for exporters in emerging economies? Making them poorer.
Well done Bill ... you've just made everyone even poorer. But of course when you're a multi-millionaire actor luvvy why should you give a shit!