Funny how you asked others to “use a single source that contains the numbers”, and yet you make arguments without providing any sources, as you did in your other comment I linked above.

How do we know your arguments aren’t “based on really really shaky data”?

No one provided sources here. A partial source was provided by the other commenter. But if you ask, the source for inflation control is OECD inflation data, the source for Tokyo GTA GDP per capita is Wikipedia/SCMP, and the source for Beijing administrative region GDP is official national numbers.