"Stocks For The Long Run" (1994) by Jeremy Siegel

A professor at the Wharton School of Business, Jeremy Siegel makes the case for - you guessed it - investing in stocks over the long run. He draws on extensive research over the past two centuries to argue not only that equities surpass all other financial assets when it comes to returns, but also that stock returns are safer and more predictable in the face of the effects of inflation.