Stock prices can exhibit irrational behavior in the short term, but over extended periods, the market effectively identifies successful and unsuccessful companies, which supports The Motley Fool’s advocacy for long-term investing. The Trade Desk (NASDAQ: TTD) has experienced a remarkable return of over 2,300% since its IPO in 2016, highlighting its potential in the competitive advertising industry. However, despite its impressive long-term performance, the stock has declined over 40% from its peak, raising questions about its status as a long-term winner.