https://i.ibb.co/0YpY4dG/image.jpg https://www.thebalance.com/list-of-inverse-etfs-and-etns-1214928 >>Inverse ETFs use **derivatives**—financial instruments that derive their value from another instrument or instruments—to mimic the opposite performance of their underlying benchmark. These derivatives typically include various types of futures contracts, which are agreements to buy or sell a particular asset at a set price on an agreed-upon date. ETFs' share prices generally correlate to the net asset value of their holdings. https://www.zerohedge.com/markets/coronavirus-makes-market-impossible-predict >>It is impossible to predict what lays ahead! The coronavirus outbreak could be a nothing burger or become a watershed event. A mountain of debt has formed over the years and whether countries and central banks can hurl enough resources at this crisis to calm a growing fear remains to be seen. It is fear versus more promises of stimulus and at some point, all bets are off. To highlight the vulnerability of the financial markets we can always turn the spotlight back upon derivatives. Hundreds of billions of dollars do not matter when we are talking about death or something like the derivative markets. ... Several books on derivatives have been written and the size of the derivatives market could be larger than $1.2 quadrillion. To put this in perspective it is about 20 times the size of the world economy.