tiffany wilding, u.s. economist over at pimco.is bloomberg. ♪ g. ♪ a historic day in oil markets as we saw those futures contracts dip into negative territory, well into negative territory. the bigger question is about demand issues. we want to bring in m.i.t. professor of systems engineering and the professor of the center for engineering. he has been with us before to talk about supply chains. professor, we want to start off with what we saw in the oil markets today and what we can extrapolate with regards to the oil supply chain. >> first of all, wow. we saw something unprecedented, clearly. no demand for oil because there is no way to store it. unless you are in the business of oil storage or owning very large capacity tankers that float on the ocean, you are losing money. oil is just not selling. oilthe question for the companies is, when is this going to turn? we have seen that futures contracts are not quite negative. because people are betting that may, june, july, the markets will turn. it is a question of when the market