If you're holding shares of Walgreens Boots Alliance (NASDAQ: WBA) in hopes of it turning around promptly, I think that now is the time to cut your losses on the struggling pharmacy chain and allocate your capital elsewhere. Here's why.

One of the criteria that can help an investor decide when to sell a stock is whether the investing thesis they formed as a rationale for buying the stock is still valid.

Let's assume you bought Walgreens stock 10 years ago, expecting it to be a safe stock that generates steady and growing dividend income, and modest share-price appreciation. You may have also anticipated that its line of business, providing retail pharmacy services, would hold up relatively well over time even if the world changed a lot.

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Source Fool.com