GDP (gross domestic product) represents a nation's total income. The rest of the variables are various measures of national saving and investment, or in other words, changes in total wealth. In order of increasing comprehensiveness, these measures include: Net investment = net fixed produced capital formation and overseas investment; Green investment = Net investment + change in natural capital; Genuine savings = Green investment + education expenditure; GSTFP = Genuine savings + Net present value of total factor productivity (i.e. technological change).
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