I don’t know yet how long rounds will last. But it will be between 3 and 5 weeks. between rounds you can change your home city.
I also will add special certificates. They don’t lower the cost for the workers to make a certain product, but they will have other effects. That can be the right to start something (like a private bank) or to shorten the time that is necessary for a certain action or that will lower other costs.
I have some ideas for special certificates, but when the game grows, more special certificates will be available.
1. Merchant (lower the toll cost?)
2. Private bank (makes it possible to start a bank)
3. Stock market expert (lower or ban the transaction cost for shares)?