The document provides a historical overview of global stock market performance over the past several decades from the 1960s to 2011. It notes that the 1980s, 1990s, and 2000s brought economic and political turmoil, including high inflation, currency crises, two Gulf Wars, and two major stock market crashes. However, despite downturns, global stock markets provided positive returns overall for investors in the 1980s, 1990s, and late 1990s/2000s. The document concludes that while the next 20 years remain uncertain, investors can prepare by paying down debts, saving and investing prudently over the long run as history shows markets tend to rise over time.