Dividend Reinvestment — Compounding via the Ownership Cycle
A Dividend Reinvestment Plan (DRIP) automatically converts cash dividends back into additional shares of the same security. Over decades, this single mechanism is responsible for the majority of total return in mature equity markets — historical studies of the S&P 500 attribute roughly 40% of long-run nominal return to reinvested dividends.
The Mechanics
Each period: dividends paid = shares × price × yield; new shares acquired = dividends ÷ price. The share count grows endogenously, accelerating future dividend income even before any dividend rate growth.
Why DRIP Wins
- Zero brokerage on reinvestment in most markets.
- Forces discipline — no behavioural temptation to spend the cash.
- Captures dollar-cost-averaging across decades.