Aarggh... After I built Slave Markets where ever possible, because according to the Civilopedia they auto-produce workers every 10 turns, I accidentally discovered this:

So apparently the Civilopedia "mixes" two different things in one entry:
So I guess I just wasted a lot of shields and money for an improvement which does in effect nothing but creating unhappyness... yeah!

So apparently the Civilopedia "mixes" two different things in one entry:
- An improvement named "Slave Market", which costs 10s, causes one unhappy face and increases production by 25% (which in totally corrupt towns of course amounts to nothing...
)
- A small wonder named "Slave Fort", which costs 100s and produces a worker every 12 turns (not 10...)
So I guess I just wasted a lot of shields and money for an improvement which does in effect nothing but creating unhappyness... yeah!
