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Investing

Proof that falling share prices can be good for your portfolio

Updated by The InvestorNovember 30, 20126 Comments

When you’re investing in a bear market, it’s easy to forget that share prices can go up as well as down.

This daily volatility scares people off during bull markets, too. It can be hard to watch your net worth fluctuate according to the whims of Wall Street (which is one reason I believe it’s better to focus on your portfolio income).

At least this volatility is potentially making you richer – provided you’re trickling money in regularly over the long-term.

With so-called dollar-cost averaging, you buy more shares when they’re cheaper and less when they’re expensive. The volatility actually improves your returns.

Mike at Oblivious Investor created this three-minute video showing the maths:


bear markets drip feeding dollar cost averaging video
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6 Comments

  1. Dave on November 30, 2012 10:47 pm ( #1 )

    Presumably the volatility is not quite so good when you are steadily transferring your investments to cash/annuities.

  2. Mike Piper on November 30, 2012 11:25 pm ( #2 )

    Dave,

    That’s exactly right. Whether you’re dollar cost averaging into or out of the investment, volatility tends to result in a lower average share price. And when you’re the one selling, that’s not a good thing.

  3. ermine on December 1, 2012 10:44 am ( #3 )

    @Dave perhaps that’s where you need value averaging 😉

    Always puzzled me why people enter the market over many years for their pensions and then come out of it all of a sudden and grouch that annuity values have plummeted. The rational reverse of the slow entry would be a slow annual purchase of part-annuities in a ladder across say ten years from 60 to 70. This also helps with the problem of younger pensioners fearing dying early leaving their estate nothing. The system isn’t set up to favour that at the moment but it’s high time it got changed that way. The single snapshot annuity purchase is the most broken part of the way pensions are done in Britain IMO. Diversification works across time as well as across asset-classes.

  4. Tyro on December 1, 2012 12:13 pm ( #4 )

    @ Ermine: good idea! Why not send it to Steve Webb?

  5. Fizzle on December 30, 2018 6:04 pm ( #5 )

    Why can’t I see the video? It just doesn’t appear on the blog

  6. Maven
    The Investor on December 30, 2018 6:38 pm ( #6 )

    Hmm, it looks like the video has been dropped. Will try to find a replacement — thanks for the heads up!

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When investing, your capital is at risk and you may get back less than invested. Past performance doesn’t guarantee future results. All content is for informational purposes only. I make no representations as to the accuracy, completeness, suitability or validity of any information on this site and will not be liable for any errors or omissions or any damages arising from its display or use.

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