Investor who manages $900 million in assets says there’s one investing hack everyone should know: ‘I wish they would teach it more in high school’

Core Insights - Mohnish Pabrai, a notable value investor managing approximately $900 million, advocates for the Rule of 72 as a fundamental concept for investors [1][2] Investment Principles - The Rule of 72 helps investors calculate the time required for money to double based on a given interest rate, emphasizing its importance in financial education [2][3] - Pabrai illustrates that at a 7% return, money doubles in about 10 years, while at 10% and 15% returns, it doubles in roughly 7 and 5 years respectively [2] Historical Example - Pabrai uses the historical sale of Manhattan for $23 in 1623 to demonstrate the power of compound interest, suggesting that if invested at 7% annually, that amount would have grown to approximately $23 trillion over 400 years [4][5] - The example highlights that even a small initial investment can yield significant returns over a long period, reinforcing the idea that the duration of investment is crucial [6] Practical Advice for Investors - Pabrai advises investors to adhere to three key principles: spend less than earned, start investing early to maximize compounding, and focus on broad market indices instead of individual stocks [6] - He suggests using platforms like Fidelity or Robinhood to invest in the S&P 500 index as a straightforward investment strategy [7]