Day traders have driven stock-market euphoria to an 18-year high, boosting the odds of a downturn in the next year to over 70%, Citi says

· *Day traders have helped to drive stock-market euphoria to an 18-year high, raising the odds of a market downturn in the next year to over 70%, Citi strategists said last week.*
· *"These new participants have exploded arguably speculative buying which has goosed up the numbers of Nasdaq shares traded," which feeds into...