" We try not to have many investing ‘rules,’ but there is one that has served us well: If we decide we were wrong about something, in terms of why we did it, we exit, period. "
- David Einhorn

In simple terms, the quote suggests that when making investment decisions, it's crucial to reassess your initial reasoning and be prepared to cut losses if you realize you were wrong about the underlying factors that led you to invest. This approach emphasizes the importance of being adaptable and willing to acknowledge mistakes rather than holding onto a failing strategy or position.

The deeper meaning behind this quote is rooted in the philosophy of minimizing potential damage by swiftly recognizing when an investment thesis has failed to materialize as expected. It underscores the value of honesty with oneself about the reasons for investing and being prepared to act on that honesty without hesitation. By doing so, investors can avoid compounding their losses through stubborn adherence to a flawed strategy or hope-based reasoning. This principle not only applies to financial investments but also to broader decision-making processes where it's essential to remain flexible and responsive to changing circumstances.

David Einhorn is the author of this insightful quote. He is an American hedge fund manager known for his contrarian investment strategies and his ability to spot and profit from market anomalies. As the founder and president of Greenlight Capital, Einhorn has gained recognition for both his successful investing track record and his candid commentary on financial markets. His approach often involves thorough research and a willingness to challenge conventional wisdom—a trait that is evident in this quote about being prepared to exit an investment if the initial rationale proves incorrect.