> But neither Walmart, Kmart, nor Sears had as big of a grip on US economy as Amazon does simply, because Amazon is not just a giant online store Citation need

> But neither Walmart, Kmart, nor Sears had as big of a grip on US economy as Amazon does simply, because Amazon is not just a giant online store Citation needed — all three have enjoyed periods in history as dominant nationwide market leaders in retail. Sears' mail order catalog was essentially the pre-Internet Amazon, and commanded a comparable scale.