Less than 1% of active stock investors beat the market, yet most people can outsmart 90% of investors by doing nothing. Billionaire value investor Mohnish Pabrai shares the nine mental models—from avoiding the mistress trap to studying businesses obsessively—that transformed him from an engineer into a $1B+ asset manager and reveal why patience, temperament, and alignment with your life's calling matter more than IQ. Fewer than 1% of active stock pickers outperform the market; index funds beat 90% of investors without requiring financial expertise or effort.