Mukesh Ambani’s $2 business formula continues to attract investors; after Facebook, Google, time for Amazon

Mukesh Ambani has joined the league of world’s richest with the help of a simple formula: assembling admirers for $2 businesses. First he got Facebook Inc. and Google to back his fledgling digital ambitions, and now he may be trying to entice Amazon.com Inc. into his retail venture, already India’s largest.