Rename Rule 2.3.1 to “Production”.
Add a new subrule to Rule 2.3.1.  Give it the name “Cash” and the following text:

Cash is easier to produce than other goods.  Instead of the normal yield, anyone producing Cash gains $1M for every point of Production allocated to producing Cash, up to a maximum of five times the square root of the amount of Production e spent producing Cash.

The production rights for Cash are in the Public Domain.

Add a new subrule to Rule 2.3.1.  Give it the name “Factories” and give it the following text:

Factories require more costly materials to produce than other products.  Whenever a factory is produced, its new owner loses $10M in cash.

If any Corporation has more than three times as many Factories as Offices, the excess Factories do not count towards calculating Production.  The Production Rights for Factories are in the Public Domain.

Add a new subrule to Rule 2.3.1.  Give it the name “Offices” and give it the following text:

Offices require more costly materials to produce than other products.  Whenever an Office is produced, its new owner loses $5M in cash.  The Production Rights for Offices are in the Public Domain