"Stocks for the Long Run" by Jeremy J. Siegel argues that investing in stocks over the long term is a smart financial move. Despite short-term risks, stocks have historically outperformed bonds and other investments since 1802, with an average return of 8.4%. This means that stocks are a better choice for long-term goals like retirement savings or leaving money to heirs. The book is based on academic research and provides evidence that stocks offer a higher return compared to bonds, known as the equity risk premium.