The major stock averages are trading at fresh all-time highs, but don't take too much comfort in that if you're an investor. The shelf life of your stock holdings is getting shorter as algorithms keep getting cheaper.
We are witnessing a mass extinction of all kinds of businesses.
I am an Amazon Prime member. My wife and I trust it and find it wonderfully convenient, as do tens of millions of other people. But in retail, where profit margins have been under immense pressure, it doesn't take much of a hit to sales for earnings to take a beating.
The new litmus test I use before buying a stock is to ask, "Could Amazon get into this business?"