This is just for fun.
Based on the cost of non-magical items, one could presumably deduce a conversion rate between Pathfinder and the real world. Of course, worlds and nations differ, so some goods or services will be more or less than they will be in other worlds and nations, so several indices would be needed.
Economic indices could include:
- Cost of food (meat, bread, eggs, etc.)
- Cost of a basic meal at a restaurant
- Cost of lodging
- Cost of clothing
- Cost of alcohol
- Cost of personal transport