I suspect it might be but in its core it points at a truth, anyone who works in a country creates value and anyone who spends their earnings in a country contributes to tax. And I would not be surprised that proportional to their income immigrants end up paying more tax to their country than a billionaire.
probably by questionnaires on spending habits
Seems to me that no matter how you slice it, whichever way the reports are being compiled, the accuracy is going to be extremely low.
I suspect it might be but in its core it points at a truth, anyone who works in a country creates value and anyone who spends their earnings in a country contributes to tax. And I would not be surprised that proportional to their income immigrants end up paying more tax to their country than a billionaire.