Robert Vos: “If you tax by, for instance, 1 percent the wealth held by billionaires, so meaning everybody holding more than $1 billion in wealth, that would not really affect them in terms of their incomes or just the revenue. The income flow they would already have on their wealth holding would by far outstrip the tax you would take away from them. So, in that sense, it would be another tax, which also makes sense from any economic theoretical argument.”