I think early game all of the money will be naturally retained in Ming's (and Japan) trade node. The only way to really maximize that is by conquering land to get to other trade nodes (the japanese one for instance).
Later in the game europeans will come and try to steer trade away with merchants, fleets, and maybe land grab. Then you should try to deny them that by holding on the land and denying fleet basing rights so that their ships would be out of support range. Easier said than done.
In any case I'm afraid that for China, the trade game is a primarily a conquest game.
Later in the game europeans will come and try to steer trade away with merchants, fleets, and maybe land grab. Then you should try to deny them that by holding on the land and denying fleet basing rights so that their ships would be out of support range. Easier said than done.
In any case I'm afraid that for China, the trade game is a primarily a conquest game.