Amazon’s expansive list of highlights that contributed to record fourth-quarter profits is a handy reminder of its various interests. Alongside the grocery chain Whole Foods and its cloud computing service Amazon Web Services (AWS), the company gave a shoutout to businesses as disparate as Amazon Fashion, Amazon Studios, the doorbell detector Ring and the delivery network Amazon Air. The thread that connects this discordant group is subscription service Prime. Members get discounts in Whole Foods, speedy deliveries for online purchases and access to video and music streaming services. Healthcare will eventually feed in too. Given that Amazon’s ambitions are directly linked to the success of Prime, the record number of subscribers it announced in the last quarter is reason to celebrate. In the mould of Facebook and Apple, Amazon’s revenue and earnings too were better than expected. AWS remains the pick of the bunch. Its revenues made up about a tenth of the total $72bn yet contribute...

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