What's the best day to buy slaves? Black Friday on the black market.
Are you equating slaves with black people?
Everyone worth being called a person is above being a slave. The rest of them are just objects made of flesh and bones.
Black people are humans just like you and me, and when you equate them with slaves you perpetuate a harmful stereotype about African-Americans. Consider how you would feel if people thought that you should be a slave simply due to your race. Read up on the history of African-Americans and try to be more conscientious about their unique struggles.