There is practically no reliable info on the bitcoin economy, in particular on the flow and ownership of bitcoin by country. (This is a serious problem for would-be investors.)
Naaah - not a problem for investors. There is a simple calculus involved. Figure out if you like the long-term prospects of bitcoin. If so, buy as much as you can afford. Hodl. Done. No detailed info needed.
Day traders, well, that's a different problem.