Get ready to buy.
Our most reliable technical indicator — one that has historically been 99% accurate — is suggesting that stocks are poised for a major breakout.
Bangladesh butter production surged in February, as moderating grain prices allowed Bangladeshi dairy farmers to boost production by getting higher milk yields from their existing stock of cows. Meanwhile, butter production in neighboring India dropped significantly in February, as a change in government farm subsidies forced Indian dairy farmers to cull their herds.
With Bangladeshi butter production set to rise further, we should be looking at a massive rally in the S&P 500 throughout March and April.
By now, I sincerely hope you realize I’m joking.
Whether the S&P 500 goes up, down or sideways over the next two months will have absolutely nothing to do with Bangladeshi butter production. But in a paper published two decades ago, David Leinweber and Dave Krider found that butter production in Bangladesh had the tightest correlation to the S&P 500 of any data series they could find.
It wasn’t GDP growth and it wasn’t earnings… it was Bangladeshi butter, which explained 99% of the S&P 500’s movements.
The authors weren’t quacks. They knew the correlation was a random coincidence and completely meaningless. But they published the paper to get a good laugh.
Stay with me here… they wanted to make an important point about number crunching. Correlation does not mean causation and if your model doesn’t make intuitive sense… it’s probably bogus.
I’m not bashing quantitative models here. Done right, they can help you build a really solid trading system. Various value and momentum models have been proven to work over time.
But the trading system needs to reflect some sort of fundamental reality or it’s one small step removed from voodoo.
Adam touched on the same idea two weeks ago in Economy and Markets. As Adam wrote, “Computers, databases and statistically sound algorithms can only refine the discovery and implementation of a fundamentally sound investment strategy. At the end of the day, computer algorithms or not, you still need a rock-solid investment strategy.”
The model isn’t the strategy. It’s a tool to help you execute… nothing less, nothing more.
Whenever you see someone touting a trading strategy, ask for an explanation of why it works. Back-tested returns aren’t good enough. If they can’t explain the fundamentals behind their model, it’s probably just a matter of time before they blow up.
Oh, and one more thing about Bangladeshi butter. Leinweber wrote in Forbes a few years ago that he still gets phone calls — 20 years later — asking for current butter production figures.
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