@StephanieJane @Heliograph

There are the rules, the PROSPERITY section refers to the respective paragraphs of the former section.
Prosperity starts on page 6:

https://landlordsgame.info/games/lgp-1932/lgp-1932_rules.pdf

Another page:
https://landlordsgame.info/games/lg-1906/lg-1906_egc-rules.html