Is to take taxes of each transactions automaticly some small %
Another issue is that by addressing transactions, we are penalising the free flow of capital. The more times it's moved, the more it gets taxed. This disincentivises spending, and encourages hoarding. It also creates issues for large companies where money may flow between different departments or sub-companies, getting taxed again at every step.
The fundamental issue I believe is that income tax does not work effectively as a reducer of inequality, partly because the rich have (legal) tax avoidance schemes, but more so because the rich have existing assets that are earning them money that is not taxed as income. It has been argued, by Thomas Piketty amongst others, that in order to address inequality we need to start taxing wealth as well as income. It's a truism that the distribution wealth across a population is much more unequal than is the distribution of income. This issue worsens when - as now - the rate of return on capital exceeds the GDP growth rate. The rich get richer faster than workers, because their investments give them a higher annual % yield than the annual % increase in worker pay. This is exacerbated by the fact that the richer you are, the better the investment opportunities available to you.
Taxation of transactions won't address this. Taxation of wealth will - however this is obviously beset by practical issues such as how such a scheme could be implemented on a global scale, because the people we need to tax are to a large extent the same people who determine how those economies function. Convincing billionaires to vote against their own self-interest is always difficult, but perhaps this may be viable if inequality reaches such a level that it provokes widespread civil unrest.
