Truck tonnage shows economy continues to grow

Truck tonnage in January was up 6.5% from a year ago, strong evidence that the economy continues to expand. 

I like this chart because it shows a decent connection between increasing truck tonnage (a good proxy for the size of the economy) and the S&P 500. This is by far from perfect, but it does help flesh out my thesis that the stock market is rising because the economy is growing, however slowly. When trucks are moving more stuff around, it's highly likely that economic activity is expanding.