EricK
Senior Member
Taxes as a % of GDP makes perfect sense and is a highly valid basis to judge whether a country is making those who profit off of public resources and infrastructure are paying their due back into those resources.
Every single dollar of GDP is dependent upon the use of public resources, and total GDP is highly correlated with population, and thus should be highly correlated to total spending since the more people, the more public resources that are needed to serve the population.
If this were the case you would expect GDP per capita to be approximately constant. And it is far from so.
Suppose a glut of enterepreneurship led to US employment increasing massively without any increase in population. GDP would significantly rise too, but there is no reason, as far as I can see, that total government spending would need to rise too - and certainly not in proportion to the increase in GDP.