Eludere la tobin tax

Against a financial transactions tax http://marginalrevolution.com/marginalrevolution/2015/11/against-a-financial-transactions-tax.html

I problemi della tobin tax

E’ che anziché incassare ci si perde (parola della commissione europea):

there’s just one small problem, only a tiny one, not much to worry about really, about a financial transactions or Robin Hood tax. It won’t actually raise any money.

In a modern economy, makes little difference whether we’re talking about the US or Europe, some 40-50% of any marginal change in GDP is tax revenue. If GDP goes up by 1% we expect 0.4, 0.5% of GDP to be tax revenues. If GDP falls then we expect a similar fall in tax revenues. We see this argument being made all the time right now anyway, as all too many people run around saying that it isn’t that spending is too high, it’s that tax revenues have collapsed in the recession. Yes, quite, this is exactly the same point.

So, look at those numbers again. We have a tax which will bring in 0.1% of GDP. That same tax will also cause a 1.76
% fall in GDP and we expect 40-50% of a change in GDP to be taxes. So we have a fall of 0.7 to 0.9% of GDP in tax revenues.

That is, we gain 0.1% and lose 0.7%.

Perchè la Tobin-tax non funziona

http://rassegnastampa.mef.gov.it/mefeconomica/View.aspx?ID=2010110917107737-2