The tax system has to find ways of taxing wealth and high incomes and place levies on the import of goods from countries that refuse to do so. Pre-Reagan era progressive tax rates on income, consumption taxes, capital taxes will all need to be present and or increase at the higher levels. Capital is going to be "earning" most of the income in the future, a lot more than today with ever increasing income and wealth going to fewer and fewer people. Guaranteed income will have to be introduced, not just funding programs as Gates suggests with the robot tax (now that gates is worth a ridiculous near 100 billion be wants to escape tax on his accumulated wealth it seems, which essentially came from something very much akin to the automation he now wants to tax). If this isn't done, social cohesion will falter, eventually fail, and the world will be very dystopic without such changes to the tax regime and income redistribution.