Okay, here goes...
This thread is an idea spawn from reading several posts on this thread. which gave me an idea.
Those magical posts
So I decided to do exactly as Elliott said, and produce a base economy in which magic is gradually introduced into. Starting with 0th level and working gradually up to 9th.
Following the base idea to Marxism, I decided to devide the world into three social classes.
The Low- 1st level commoners who make the basic 8gp/week, they buy low to normal quality food for their families (and/or rent a room) and produce income which at most goes to buying tools for their trade and paying taxes up to the Middle and High. Minimal skill in profession and craft skills, often forced to take 10. Life expectancy is low, as clerics dont exist to heal things and living conditions are sub par
The Middle- Higher level commoners, skilled in profession and craft skills. Make between 16 and 40 gp/week outside of producing goods on craft checks. Also includes the entertainment industry, which has high checks with decent ranks (12 ranks and +3 cha garuntees at least 1d10sp/night)
The High- Diplomats, Intellectuals and other such people. NO skill ranks in profession and rarely ranks in craft.
Note that the amount of magic wielding people is few, with about one mage/bard/druid/cleric per 30 people