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Amazon is offering thousands of discounts for its annual Prime Day event starting on Monday evening in the US.

Like many other things Amazon does, this should unnerve its competitors including Walmart, the no. 1 brick-and-mortar retailer in the US.

“A successful and well-publicized Prime Day may weigh on shares of Walmart as investors remain sensitive to Amazon’s competitive threat,” said Shawn Quigg, an equity derivatives strategist at JP Morgan, in a note on Monday.

The last two Prime Days had little impact…