An options strategy called a "box spread" is gaining steam by the billions as an alternative to Treasury bills and traditional loans. The tactic gets its name from the four-sided structure of options trades that simultaneously bet on calls and puts at strike prices for securities at a reliable spread. Potential tax and lending advantages are driving the appeal of box spreads, according to Brent Sullivan, a consultant on product distribution to sub-advisory and ETF firms. He's the author of the Tax Alpha I ...