With the help of the 'Summarizing the national accounts' figure, that we have in the Economic book. There are sections with GDP, GNP, income, indirect taxes and so on. (like a diagram)

My question is; It is the year 2060. Nation states have been abolished and there is a world government whose spending is entirely financed by income tax. How does the diagram below have to be amended?

I do not understand the question and what to do..