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The macaron is a filled cookie about the diameter of a half dollar coin that has become a foodie currency in its own right in recent years. It's simple in concept, but near impossible to get right -- and for the first time, Laduree, the French bakery and tearoom that made them famous is opening a U.S. boutique. So, let them eat cake!

Shoppers at New York's Oscar de la Renta spend more per visit than at any other retail site in the country -- more than $3,000, according to consumer finance website Bundle's "most expensive stores" list. But what pushed that Madison Avenue store above and beyond its high-fashion rivals?