This aspect of worldbuilding isn't one I thought would need much fleshing out for a sci-fi romance, but a subplot in my work-in-progress is forcing me to reconsider. One of my leads is a prince escaping an arranged marriage in the wake of a revolution, which killed all the other members of the royal family. He flees into exile with all the money from his personal account, and all of the dynasty's off-world accounts will go to him as the sole surviving heir. A big part of this character's arc is him discovering--after a lifetime in isolation where others controlled every aspect of his life--that he has agency and can use his wealth to assist refugees displaced by the brutal war his family fought to cling to power. But the nature of communications and travel in this setting makes things more complicated. Transmissions are limited by the speed of light. Since this would make direct communications between star systems woefully out of date, FTL courier boats are used to deliver everything from military orders and diplomatic dispatches to mail, news, and financial data. They're fast by the standards of this world, but we're still talking about days, weeks, or even months before they reach their destination. For example, the journey from Quetzal (where the Prince is from) to Soleco (the border system where the story unfolds) takes seven days. Accessing the nearest off-world accounts would require another seven-day trip to a neighboring system, a day or two to cross that system, and then another three days to reach the actual destination star system. Obviously, that will make tapping into those accounts a long, time-consuming process, but more questions arise the more I think about this. What does currency look like in this environment? What are the implications of your assets being light-years away for loans and credit? How do you fight fraud when the fraudster could be long gone by the time fraud is uncovered? This isn't really my forte, so I'd love to hear what you think of those questions and whether there are any others I should be asking, either when it comes to the subplot or the universe at large. Since there doesn't seem to be much speculating on interstellar economics or finance, this discussion could be useful for other sci-fi authors.