I don't think you and RisKFactoR mostly agree. I think the crux of your earlier message was lost amidst the econ jargon.
Where I think you and RisKFactoR
do agree is on the idea that,
given the same pool of labour, economies without slavery tend to do better in the long run. So a society of 7 million free labourers and 3 million slaves will tend to be economically worse than a society of 10 million free labourers in the long run, because
slaves are a relatively inefficient allocation of the same amount of human capital. And I understand that the academic consensus overwhelmingly supports this.
However,
@RisKFactoR, I think many people here (including me and Napoleon1971) are disagreeing with you (and AmericanNapoleon as you mentioned earlier) because this doesn't seem to be the appropriate analysis, at least in relation to the trans-Atlantic slave trade in the early modern period. The import of slaves from Africa into the Americas is, at least from the perspective of the 'localised' economy comprised of Western Europe and the colonised portions of the Americas, a
net input of human capital (albeit in an inefficient form)
which otherwise would not have meaningfully participated in that economy. So the question is now whether a society of 7 million free labourers and 3 million slaves will tend to be economically worse than a society of
7 million free labourers only in the long run (particularly from the perspective of the free labourers only).
To be clear, slavery is evil and unjustifiable. And I think the vast majority of people who are respectfully disagreeing with you will agree with that statement. But in terms of economics, it seems strange to argue that a net input of human capital into an economy, even in an economically inefficient form, is worse for an economy than not importing that human capital, regardless of its evil. I don't particularly want to conduct this analysis now, as I'm sure it will depend on the quantity of slaves imported as well as ownership structure, but just wanted to point out why people are disagreeing with you.
In terms of game mechanics, I hope, and don't think, separate new modifiers and systems are required to reflect the economic consequences of slavery. I would much rather that those consequences arose organically, as a natural consequence of how slavery works.
- Specifically, I think that all that needs to be reflected is: (a) slaves have lower economic output compared to 'free' commoners; (b) slaves receive much lower 'wages' than commoners, to the effect that they do not consume goods other than food and do not meaningfully participate in the wider economy as consumers; and (c) slaves are restricted from migrating to locations with higher wages. All of these are relatively 'obvious' features of slavery, I would say.
- The organic, gameplay result is that, countries are still incentivised to import slaves to increase their economic output, particularly in the early game where they have colonised lands with lots of free land but little labour to work that land; but in the long run, there is an incentive to emancipate those slaves for that further productivity, consumption, and efficient allocation of labour. Admittedly, it may be that these long term benefits outweigh the costs only at the very end of, or even after, the period of PC (or when the import of slaves becomes impossible) - but it seems that would reflect historical reality.
- Indeed, this is how slavery works in Victoria 2 - and the way by which players are incentivised to emancipate slaves via the very mechanics of the game, rather than a developer-imposed straitjacket, is really quite elegant in my opinion.