If it's about money, we all have our own individual "bank" accounts which we can use to buy and sell things. Once you're in a town, the town has a town bank, which will be used for town upkeep payments and other things. Townspeople can donate to the town bank with /t deposit <amount>. Some towns belong to a collective group of towns (a nation), which also has a nation bank (for nation upkeep, etc). Townspeople can give money to their nation with /nation deposit <amount>.