IMO not including penalties for Social Policies was a mistake

Whoops. Of course you're right. Which makes the statement about Slavery even more strange. I can't see why anyone would choose Slavery over Caste System. And if I can afford the happiness penalty, I'd choose Caste System over Emanicipation as well. Statue of Liberty + Mercantilism + Representation = 12 free science in every city, even those that don't have libraries. Caste System also let's you decide what kind of GP you want. If you want to found Sid's Sushi, you can turn 10 citizens into merchants. A bunch of artists can be really helpful in newly conquered cities.

Slavery = early game production. Caste workshops suck a big one until guilds, but really aren't great until chemistry. Caste is better for research (mostly scientist GPP) in that time frame, so it depends what you need (If you have library + great library + national epic, maybe caste isn't going to bring you much more in GPP that you care about for example).
 
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