Not only is Amazon growing faster than Wal-Mart was in the days when it rose to dominance, but it is taking market share faster than Wal-Mart did. Though Wal-Mart claimed market share at the expense of local retailers, the physical constraints of retailing prevented the big box chain from consolidating its position. But Amazon doesn’t face those constraints. With groundbreaking technology on both the customer-facing side and in back-end operations, Amazon can keep growing its market share indefinitely—in theory. What changes in e-commerce are being driven by Amazon’s growth? Drawing on Internet Retailer’s latest research, editor Allison Enright tracks Amazon’s newest developments, its potential future and what it all could mean for the rest of online retail.