What was the difference between free wage vs. slave economies

if I could remember correctly also don't know whaat time period ur talking about free wage was people who worked for free and slave economy i guess like they had to work like lots of hours for like just pennies something like that

Explanation:

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“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.