Here are my ideas and questions on the idea of a finite economy.
Monster Loot
I agree with Xandria\'s view on why monsters carry around money, especially money used in the same system as others. I see the point of dropping weapons and items they are carrying, but not similar money. The only exception would be if the monster is \'civilized\' or there is a common money translation for all, like gold or something similar. Now, take Orcs as an example. How does their society work? What is the common Orc\'s life like? If they use a system of money, what is it, and is it similar to that of the races of Yliklum (however you spell it)? Now, if they carry money around a city, that makes sense, but I don\'t see how someone will survive in a city of Orcs. Unless they are an Orc, but that\'s not exactly an exception.
What I\'m trying to say is that certain types of creatures carry money, like Orcs, and others don\'t. I never saw why dragons sccumalted wealth. What DO they use it for, anyway? Orcs live in a common society, so there is a reason for them to carry around gold. Any creature living in a somewhat civilized society (this includes Orcs), any that actually knows how to build a crude hut at best, should carry money. Otherwise, they should not carry around any, unless they have a system of trade going on.
I agree with teh idea of a monster loot pool, but only for creatures like I have stated above. This could also mean a finite economy for other societies of peoples.
Finite Money and Gaining More
How do NPCs get the money to buy everything PCs sell? They are paid by the government. How does the government get their money? With taxes, mints, and trade. Now please excuse my ignorance of how governments work, but here are my ideas. I agree with the idea of a tax, even if it does get annoying, but that at least forces players to get a job and get money other than killing.
WIll add more later.