DETROIT (WWJ) – Retailers are encouraging people to get a jump-start on their holiday shopping –  hoping you think Christmas long before you think Thanksgiving.

University of Detroit-Mercy Marketing professor Mike Bernacchi says despite the early start, it shouldn’t affect sales on Black Friday– those are expected to be up from last year.

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“On Black Friday, everybody hops all over the place trying to get the best deal they possible can and if you can have an early Black Friday … what we wind up with, is the ability to get the consumer to yourself right at that particular time,” noted Bernacchi.

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Bernacchi notes that some major stores are already having ‘Super Sale Days’ and stores like KMart and Sears are advertising lay-a-way incentives.

“You know – the projection is anywhere from 2 1/2 to 4 percent overall for the country and that’s certainly not shabby, it does convert into billions of dollars,” said Bernacchi.

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Another change from last year’s shopping season– Bernacchi says to expect fewer items on the shelves– after retailers had too much left on their hands in 2010.