From what i've read i always thought they were all assigned jobs and given all they required to live in return for their services(food, clothes, pottery etc) as you say they had very little in the form of money so this was the easiest way to do things, i didnt see it is comming out of the state budget as most of what they produced was from resources in their own lands and by these same workers, there wasnt so much a circulation of money more a circulation of what was produced. The theory goes that the people that built the pyramids were farm workers from along the nile during the months when the nile flooded and they had little work to do, only a small party was left behind all year round(at least small compared to the numbers they had from the farms).