Imperial
Which rondel actions are compulsory when a nation's marker stops on them?
Paying interest on the Investor space is compulsory: if the treasury is short, the controlling player must cover it from personal cash, and the Swiss Bank rule suggests a nation should not land there if the treasury cannot pay in full. Production, Import and Factory are optional, because the rulebook says the nation may or is allowed to act. Posters disagree on whether Factory is required, and the better reading is that it is allowed but not required.