Yalon is a town in Thena that has been taken over by monsters from another dimension. Take the job at the Temple of Gynor to rid the town of these foul creatures and you gain the deed to the entire town.
Once you are able to bring the Carpenter from Kanlin to Yalon, she will charge you to repair the buildings either back to their former glory in order to make Taxes off the buildings, or to a forced labor factory nightmare that makes you an even larger profit. It's up to you whether to remain ethical and take a lower cut, or go unethical and make every piece of gold you can.
Ethical Route:
Repairing the Inn will set you down a path of being ethical and wanting a better place to live
This Ethical path leads to a full booming town with your Inn, Weapon's Shop, and Item Shop profiting well enough to pay you the highest taxes.
How Taxes work:
Taxes you collect go up depending on how well the town is doing. The more you upgrade the town ethically, the more amount of taxes you can collect from each business. To collect the taxes, you just have to talk to the shop keep after so many wins in battles. 4 wins in battles unlocks 10% of Max Taxes given, 8 gives you 30%, 12 gives you 50%, and 18 battles won gives you a full 100% Max Taxes.
Unethical Route:
Meanwhile, building your first factory leads you down a harsh path of unethical forced labor, muggers that random encounter you, but a larger profit. 
This eventually leads to a dark and disturbing town, but much higher amount of gold earned in profits.
How to Collect Profits:
Same as taxes. You have to win battles to earn a percentage of the Max Profits. 18 battles won, you get 100% of the profits. Anything past 18 battles though are wasted and will NOT count toward the next set of taxes or profit earned. So make sure to visit Yalon often and keep track of how many battles you've won as well.