The Dow Jones Industrial Average has undergone many changes since its lengthy history. The index has been tracking 30 companies for more than a century, and recent changes have strengthened it. The Dow Jones has recently been kicking out underperforming stocks and replacing them with big tech companies. Concentrating on the Magnificent Seven stocks has been a winning formula for several years. There is a fund called the Roundhill Magnificent Seven ETF (NASDAQ:MAGS) that only has the Magnificent Seven stocks ...