“The research does not suggest that the minimum wage should not rise or that rising wages do not have any benefits,” the study’s author Christopher Thornberg said in a statement, according to Restaurant Business Online.

“However, increases to the state’s minimum wage in recent years have been the fastest since California first set a minimum wage in 1916 — and that pace is creating certain negative consequences for smaller businesses and people who need the most help rising out of poverty,” Thornberg said.

Minimum Wage Hurts Restaurants Most

“Data analysis suggests that while the restaurant industry in California has grown significantly as the minimum wage has increased, employment in the industry has grown more slowly than it would have without minimum wage hikes,” the study, published in April, says. “The slower employment is nevertheless real for those workers who may have found a career in the industry.”

Researchers studied the minimum wage’s current effects on businesses from high-end restaurants to fast-food shops. They found the minimum wage has more of an impact on full-service restaurants where customers are served by waiters and food is brought straight to the table. Researchers also found that the minimum wage slowed growth more in low-income areas.

Researchers estimate that the minimum wage increases will cost the state roughly 30,000 jobs from 2017 to 2022.