During the Great Recession, it’s become common knowledge that a leaner operation with fewer employees is more profitable. But what if that isn’t true, especially for large retailers? From Surowiecki:

“The big challenge for any retailer is to make sure that the people coming into the store actually buy stuff, and research suggests that not scrimping on payroll is crucial. In a study published at the Wharton School, Marshall Fisher, Jayanth Krishnan, and Serguei Netessine looked at detailed sales data from a retailer with more than five hundred stores, and found that every dollar in additional payroll led to somewhere between four and twenty-eight dollars in new sales. Stores that were understaffed to begin with benefitted more, stores that were close to fully staffed benefitted less, but, in all cases, spending more on workers led to higher sales. A study last year of a big apparel chain found that increasing the number of people working in stores led to a significant increase in sales at those stores.

The reasons for this aren’t hard to divine. As Fisher, Krishnan, and Netessine show, customers’ needs are pretty simple: they want to be able to find products, and helpful salespeople, easily; and they want to avoid long checkout lines. For a well-staffed store, that’s no problem, but if you don’t have enough people on the floor, or if they aren’t well trained, customers can easily lose patience. One of the biggest problems retailers have is what is called a ‘phantom stock-out.’ That’s when a product is in the store but can’t be found. Worker-friendly retailers with more employees have fewer phantom stock-outs, which leads to more sales. And happy workers tend to stick around, which saves the costs associated with employee turnover, like hiring and training.”