Well as to how it'd work out, history already gives us a hint - exactly this situation has played out at least twice before (probably more often) in the real world.
When Athens rose to prominence it started to acquire lots and lots of slaves from its wars of conquest. Large landowners (who just like in medieval europe formed the military elite and provided most of the commanders) got lots of slaves.
Slaves ARE cheaper than serfs - and more efficient. You can work 'em all year and get all of the value. You can work 'em to death and buy new ones cheaply, if there are enough of them - and at the peak of the slave trade, a slave in Rome cost about 500 to 1500 denarii - less than 16 Aes, which was the cost of a Modius: enough wheat to make 20 loaves of bread. Or about the same as a donkey (put that into today's prices: about 100 bucks). Plus - unlike serfs - you can buy educated slaves at a small premium, which means you can set them to running your industry/agriculture. You really *don't* need peasants if you have slaves
We know what happened in Athens. The wealthy class, who had the most slaves, were able to prosper, even though the influx of cheap labor dropped prices. The poorer landowners and craftsmen were unable to compete and either sold their property or simply walked away from it - ending up either in the army, in the city (which started to develop big slums at this point) or dead. Political unrest soared. However, the slave-based economy (not just agriculture, but also slave-based craft workshops and slave-based mining) was so much more efficient that Athens established a hegemony (the so-called golden era) and a disproportionately large economy (at one point half the residents of Athens were slaves). This imbalance was one of the causes of the war that bought Athens down and with the slave trade cut off, the economy crashed hard.
In Rome the same story played out, a few centuries later. They also became owners of hundreds of thousands if not millions of slaves (nobody knows for sure how many, but most historians agree about 300-400 thousand in Augustinian Rome, which at the time had a population of about a million. The military/economic elite had the most slaves and they added the extra twist that the old roman system had a patron/client system based on debt. Many small landowners could not pay their debts - or even buy food - as agricultural prices fell, so were arrested and sold into slavery themselves. This led first to political unrest, then mass rioting and eventually revolt and mutiny in the army, before a law was passed preventing romans being enslaved for debt. Hundreds of thousands lost their land and ended up in the city or in the army. The world's first social welfare programs were set up to keep the unemployed proles (who lived in huge, horrible crime-ridden slums) from rioting - all underpinned by the surplus generated by slave labour. The end was the same too: when Roman military expansion reached its limit, fresh suplies of slaves started to dry up and the roman economy started to go - sliding first into recession and then collapse. With economic collapse came the end of the expensive military and essentially the end of the empire.
Shouldn't be too hard to impose that pattern on a mock-medieval medieval economy: the basic economic structures are more alike than different and though the political structure is different, the elements of unrest and repression and conciliation are the same.
cheers, Mark



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