The Globe and Mail reports in its Saturday, Oct. 7, edition that the latest retail boom is in zero-days-to-expiration options -- or ODTE in trader parlance -- which represent single-day bets on the direction of markets. The Globe's Tim Shufelt writes that until very recently, this was the kind of sophisticated trading tool relegated to professionals. However, retail investors have piled in and now account for about a third of all trading in 0DTE options tied to the S&P 500 index, according to CBOE Global Markets. 0DTE options reduce the duration of contracts to a single day or even a number of hours. 0DTE options now make up half of all S&P 500 options trading activity, according to JPMorgan. First Avenue Investment Counsel chief investment officer Brian Madden says, "There is a lot of professional money sloshing around in those instruments, but they're widely available and accessible, and it's like rocket fuel for a speculative retail investor." Traditionally, a problem for advisers and financial planners was in convincing investors to take on enough risk. Excessive loss aversion can result in overly conservative portfolios and ill-advised selling when the market is in decline.