What caught my eye this week.
Writing a regular personal finance and investing blog isn’t all glamour, acclaim, and partying with insouciant French models, you know.
Sometimes it can even be a tad dispiriting.
You, dear reader, can come across a comment like…
- “I don’t see the point in bonds – I decided not to buy any when I started investing 18 months ago and I haven’t looked back!”
or…
- “Stop trying to pump up FED-inflated shares even higher I bought shares in 1999 and they crashed in 2000 and I lost everything IT WILL HAPPEN AGAIN.”
or…
- “Index funds are for losers. I got my Amazon shares in 2005 when I didn’t know what I was doing and then forgot I owned them and now I’m rich.”
…and you can shrug and be glad you decided not to invest with that particular active fund manager.
(Ha ha. Little joke there, active fund manager friends.)
But as someone who has been writing a blog about this stuff for ten years – well over 1,000 articles in total – it’s hard not to take such silliness personally. Especially when it’s written in the comments of your own website.
It’s understandable that investors in the 1930s, the 1950s or even the 1980s might base their beliefs about investing on personal experience.
Up until the 1990s you had to hunt to find good books about investing.
As for accessing data to reach your own conclusions and devise the right plan – you had to be rich already to buy that data in the first place!
Nowadays though we’re drowning in solid investing advice. Obviously lots of rubbish, too, but there’s so much good stuff being written it’s almost excessive. Filling this page with links every week takes a while, but it’s never for a lack of decent material.
Resources like the wonderful Portfolio Charts has brought data to the masses, too.
So why do some people persist with hokey homemade theories based on just a few years’ personal experience?
Presumably it’s evolutionary. There is good reason to believe what you’ve seen before with your own eyes when another caveman tells you to go cuddle a sabre-toothed tiger.
But as Michael Batnick pointed out in his Irrelevant Investor blog this week, your personal experiences and mine may differ wildly – and when it comes to investing both may be inadequate when it comes to the big picture.
Look at how various cohorts of investors fared with the S&P 500 over the first ten years of their investing life:

Those are extremely different outcomes. As Batnick notes:
Consider an investor who started in 1946 (black) versus one who started in 1966 (light blue).
The former got the chance to invest in a market that compounded at 16.7% while the latter saw stocks compound at just 3.3% while being ravaged by two bear markets.
Now you and I might look at that graph and conclude luck plays a huge role over the short-term in investing.
Some ambitious folk might even believe the graph demonstrates that you need to pay attention to levels of market valuation or momentum when deciding how much to allocate to shares – though I wouldn’t recommend it for most.
But what one should clearly avoid doing is concluding “shares are the only place to be” because you happened to get going in 1946 or “when I hear the phrase ‘stocks for the long run’ I reach for my revolver” because you started investing 20 years later.
True, we can never be sure the future will look like the past.
But it must be better to be aware of a hundred years of ups and downs than to believe investing started the day you opened your broker account.