You may use the following script command to block one of the known methods of using Subsidiaries for exploitation.
Anti-exploitation Game Rules=On
This line enables the special anti-exploitation game rule. It has the following effects:
1) Under the special anti-exploitation game rule, your company can only merge with another company of which it DIRECTLY owns a majority of the shares.
This prevents the parent company from merging with any subsidiaries owned by the first subsidiary. In other words, only the first subsidiary can be merged with the parent company.
2) It has the same effects as the “Alternative Stock Sim” option for prohibiting stock trading between the player’s company and its subsidiaries, thus making it harder to speculate stocks for quick profits.
This rule is automatically enabled when playing a challenge game.
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Details of the script command: https://www.capitalismlab.com/scripts/s ... ial-rules/
Basic info about how to use a script: https://www.capitalismlab.com/scripts/script-basics/