Behind Amazon.com's Surprising Surge

The online retailer's shares zoomed Wednesday after its earnings topped estimates. One big factor: a lower tax rate

After taking heat from analysts for his spending on various new services, Amazon.com's (AMZN) CEO Jeff Bezos might now be able to enjoy a laugh. The e-commerce giant's stock price surged 26% on Apr. 25 after news of its stronger earnings during recent months.

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