The WD40 Company announced that its sales were up 7% in the third quarter, which begs the question: What's happening with duct tape?

I looked into it and drew a blank – that is, until I found this chart that suggests a relationship between the fortunes of the two products.  There's no evidence that sales of duct tape are down, but if you're an investor you might want to keep an eye on this. And if you're not an investor – well, the chart offers excellent advice on how to fix anything.