Worries about the level of demand and lack of available storage capacity pushed the price of benchmark US crude oil prices below zero. The move has hit traders, companies and oil-producing nations. FT markets editor Katie Martin explains the causes of the crash and the fallout. Read more at https://on.ft.com/2Vs8sfC. See if you get the FT for free as a student (http://ft.com/schoolsarefree) or start a £1 trial: https://subs.ft.com/spa3_trial?segmentId=3d4ba81b-96bb-cef0-9ece-29efd6ef2132
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