DAVID MARCUS: Brave new world of prediction markets can make us all inside traders

The article discusses the rise of prediction markets, exemplified by platforms like Kalshi and Polymarket, enabling bets on diverse events from reality TV outcomes to political races. It highlights ethical and legal concerns about insider trading, citing examples of individuals using non-public information to profit, such as a soldier betting on military actions and a teleprompter operator exploiting foreknowledge of presidential speeches.