Dude there's no such thing as a place where you can convert billions let alone trillions to another currency by "market" (airport) exchange rates. If you have read econ you'd know that.
Lets examine what happens if we convert currencies like this with a flat rate instead of following a statistical model:
You're asserting that a road that costs 10 million USD in US costs exactly 73 million RMB in China. Or the rent prices in US comes out exactly the same as rent prices in China, besides the 7.33 multiplier.
Remember gdp is a model to examine economy scale. So you have constructed a model where no one in China will be able to afford their necessities, where people are driving around on roads that don't physically exist in your model, on cars that don't exist, because they're not affordable at this airport exchange rate scaling to USD you're using. Government and companies are starting, working on and completing projects they could not afford in USD terms.
What sort of crazy world have you created?
Needless to say, this is not a viable model.
The statement that you have made with your airport exchange rate hypothesis is that in this world, where 1 USD -> 7.33 RMB perfectly scales up to trillions of RMB and Chinese ships dock at harbors that don't exist, construction workers build on projects the firms can't pay for, US would have a larger economy. And that is correct. But we also don't live in this hypothetical world.
