Why did the value of slaves increase at the turn of the 1800s?

As the cotton industry boomed in the South, each farm was valued as a whole, as the value of the cotton increased, so the value of the farm did and everything on it, so all the slaves on these farms were then valued higher than what they had been before resulting in the value of slaves increasing. 

The right answer would be a

Yeah why you don’t text me texting me and everybody ieeieooeueueoe was the day you