20% off or more is compelling — 10-15% is a lot less compelling. I feel like that appeals only if I was on the fence or about to purchase something from the brand already. 20% off starts to inspire me to look at products and see what I want to buy. Oh, and free shipping should always be part of the deal (or else there should be a fairly low threshold to get to free shipping). Free shipping isn’t a deal!

-- Christine

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