From the introduction:
The system hand waves a lot of the minutia of dealing with money and fantasy economies, while also giving the GM and players a solid framework to understand how the economy works. It is intentionally vague and a lot of pricing is left up to the GM, just as prices at the time might fluctuate from region to region. Coin represents hard cash gained from money-making ventures such as selling off artifacts, swindling a merchant, or being returning a kidnapped princess. Coin is expendable. Wealth represents your profession, investments, and businesses. Wealth is sustainable and provides you with the means to maintain a lifestyle, hire staff, and even employ soldiers and guards.
User summary:
A system-agnostic supplement for managing money in fantasy games.