When players wants to play a business simulation game, they want to operate a business, they don't want to work as a worker their.
The problem in this game is that, you made players to work as a worker and naturally when they established their own factory or enough money to sustain, they stop working as a worker.
That's made the economy to collapse.
And also players became uninterested to the play.
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You should limit the establishment of factories, holdings, bank, and all....
Factories must require a land, just like apartments or retail stores.
Recruit as many non-player-bot as possible.
Thanks for time.