If you're opposed to slavery, don't buy a slave! The free market will sort it out.
Lol, slavery was *literally* antithetical to the free market and part of the reason European immigrants in the North favored Democrats is because they were skeptical of Republican promises that any man - in a free labor economy - could rise to the top through hard work alone.
I know you're kidding, but to act like the defenders of slavery used anything close to a love of the free market to defend that institution is just simply unfair and disingenuous to those who praise the free market today, which is clearly the comparison you're drawing.
