Amazon's rivals are either folding up or merging with one another, hoping to provide a real challenge or at least give the e-commerce giant a run...
German grocery store chain Lidl sells its items lower than the prices of Wal-Mart.
Wal-Mart has dominated the retail space.However, can the reigning retail giant fight off growing online competitors like Alibaba and Amazon?
The Forbes list shows obvious interesting patterns. Half of these young billionaires live in California. Nine of them made their fortune in tech.