America’s labor shortage is approaching epidemic proportions, and it could be employers who end up paying.

A report Thursday from ADP and Moody’s Analytics cast an even brighter light on what is becoming one of the most important economic stories of 2018: the difficulty employers are having in finding qualified employees to fill a record 6.7 million job openings.

Truck drivers are in perilously low supply, Silicon Valley continues to struggle to fill vacancies, and employers across the grid are coping with a skills mismatch as the economy edges ever closer to full employment.

“Business’ number one problem is finding qualified workers. At the current pace of job growth, if sustained, this problem is set to get much worse,” Mark Zandi, chief economist at Moody’s Analytics, said in a statement. “These labor shortages will only intensify across all industries and company sizes.”

Private payrolls grew by 177,000 in June, a respectable number but below market expectations. It was the fourth month in a row that the ADP/Moody’s count fell short of 200,000 after four months at or above that level.

The reason for the tick down in hiring certainly isn’t because there aren’t enough jobs.

The Bureau of Labor Statistics reported that April closed with 6.7 million job openings. May ended with just over 6 million people the BLS classifies as unemployed, continuing a trend this year that has seen openings eclipse the labor pool for the first time. At some point that gap will have to close. Economists expect that employers are going to have to start doing more to entice workers, likely through pay raises, training and other incentives.