Prof. Tabarrok used the Slave market to explain the demand and supply of slaves in the discussion of Elasticity of Demand. Why do you talk about this sensitive topic in college classes? Do you want people to be reminded of slavery? It is amazing to me at this point in our life an econ professor is using the price and quantity of slaves to explain elasticity. It is very insensitive to students of color. I will never use any of his video going forward.