Companies that typically hire thousands of seasonal workers are heading into the holidays during one of the tightest job markets in decades, making it unlikely they’ll find all the workers they need. For shoppers, it might mean a less than jolly holiday shopping experience, with unstaffed store aisles and online orders that take longer than usual to fill…

Even before the holiday hiring season, employers were so desperate to find workers that they raised pay above $15 an hour, started offering four-figure sign-on bonuses and promised to pay their schooling. But that yielded only limited success. If they can’t find the workers they need in time for the holidays, employers will likely rely on existing staff to work more overtime, which can become costly for businesses and lead to burnout for workers.

“I’ve never seen a market like this,” said Matt Lavery, UPS’s global director of sourcing and recruiting, who has worked on the hiring side of the package delivery company for 24 years. “Normally when you’re talking about people coming off unemployment benefits, you see surges in candidates. We’re not seeing those.”