The primary motivation of this investor is to realize financial reward from a decrease in price of the underlying security. (capitaloneinvesting.com)
Calls — This is the right to buy a certain number of shares of an underlying security at a given price. (thecollegeinvestor.com)
Should the supply of underlying securities in an ETF become that tight, and short interest continues to rise, then the industry and regulators have a real reason to be concerned. (etf.com)