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“Only buy something that you’d be perfectly happy to hold if the market shut down for 10 years.”

— Warren Buffett

Investors can learn a lot from Warren Buffett, whose above quote teaches the importance of thinking about investment time horizon, and asking ourselves before buying any given stock: can we envision holding onto it for years — even a decade-long holding period possibly?

Suppose a “buy-and-hold” investor was considering an investment into DTE Energy Co (NYSE: DTE) back in 2012: back then, such an investor may have been pondering this very same question. Had they answered “yes” to a full decade-long investment time horizon and then actually held for these past 10 years, here’s how that investment would have turned out.

Start date: 07/19/2012
$10,000

07/19/2012
$33,717

07/18/2022
End date: 07/18/2022
Start price/share: $51.64
End price/share: $123.67
Starting shares: 193.65
Ending shares: 272.59
Dividends reinvested/share: $28.59
Total return: 237.12%
Average annual return: 12.92%
Starting investment: $10,000.00
Ending investment: $33,717.34

As shown above, the decade-long investment result worked out quite well, with an annualized rate of return of 12.92%. This would have turned a $10K investment made 10 years ago into $33,717.34 today (as of 07/18/2022). On a total return basis, that’s a result of 237.12% (something to think about: how might DTE shares perform over the next 10 years?). [These numbers were computed with the Dividend Channel DRIP Returns Calculator.]

Notice that DTE Energy Co paid investors a total of $28.59/share in dividends over the 10 holding period, marking a second component of the total return beyond share price change alone. Much like watering a tree, reinvesting dividends can help an investment to grow over time — for the above calculations we assume dividend reinvestment (and for this exercise the closing price on ex-date is used for the reinvestment of a given dividend).

Based upon the most recent annualized dividend rate of 3.54/share, we calculate that DTE has a current yield of approximately 2.86%. Another interesting datapoint we can examine is ‘yield on cost’ — in other words, we can express the current annualized dividend of 3.54 against the original $51.64/share purchase price. This works out to a yield on cost of 5.54%.

Here’s one more great investment quote before you go:
“An investment in knowledge pays the best interest.” — Benjamin Franklin