that's something that harriet beecher stowe finds so odious, she start writing "uncle tom's cabin" and uncle -- captures a lot of sentiments able to use fictional story to humanize the slave experience. and throughout 1850s that starts to become a major dividing point, and you start seeing after the dred scott decision you see slight prices actually went up. so there was quite a bubble in slight prices were at auction to have what they would call a prime field hand, so we would pay, in the twins, strong, has no history of running away, the seller representation you need to make if a slave had ever run away, and so you see the average price of slaves throughout, $700, $800 on the whole, all 4 million slaves. $3 billion to $4 billion for all of the slaves in america, 4 million or so. and so to some degree in my book i note this is an irrational valuation because there was a lot of credit, you could use collateral, borrow two-thirds of the value. much of the sentiment was based on a valuation of slaves that was decoupled from the price of cotton, which many historians, walter johnson, spi