Lesson 5: Where the income goes, when it arrives, and why reinvesting it matters.Reinvest or take the cash?Same fund, 30 years. One person reinvests every dividend, the other takes the cash. How far apart do they finish?AIdenticalIt's your money either way, so nothing changes.BSlightlyMaybe a percent or two more.CHugelyDividends are a big slice of the gain.