According to Anita Bhappu, Associate Professor of Retail and Consumer Sciences, Retailers are competing for holiday workers

 Anita Bhappu, associate professor of retail and consumer sciences at the University of Arizona, said that work force still exists, but more people are working seasonal jobs as a supplement. 

“This is a second job or one of several jobs that they’re able to pull in some extra income," she said. "And that’s ideally why it works both ways, for them and for retailers.” 

The model is simple supply and demand. More shoppers are going to be in the store during the holidays, so retailers need more people there.

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The University of Arizona