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4. Inc. (AMZN): Operates as an online retailer in North America and internationally. Market cap at $122.39B, most recent closing price at $270.19.

Market skepticism remains high that the online e-tailer can justify its lofty valuation. Savvy shoppers are using storefront-based retailers to try products, and are then buying them for less at stores like Amazon.




Written by Kapitall's Chris Lau