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Some workers will never be satisfied.

The job search is always on for many workers — even those who have just gotten a new gig. Nearly two in three workers look for another job within the first three months of starting a new job, according to an analysis of 8,000 adults released this year by Indeed.com. And a survey of more than 3,000 workers by CareerBuilder.com found that roughly one in three workers say they are regularly looking for a new job — no matter what job they currently have.

“It’s the continuous job search,” says Dan Schawbel, founder of WorkplaceTrends.com and author of “Promote Yourself.” “The second someone starts a job, they’re already looking for a new job.”

It’s tempting to believe that if we were paid more, we wouldn’t look elsewhere for another job. And there is probably some truth to that notion, as recent wage growth has been slow: Average hourly earnings have risen just over 2% in the past year, which the Economic Policy Institute notes is “in line with the same slow growth we’ve seen for the last six years.

But research shows that our dissatisfaction with work is often less about money (though this is a factor) than it is about advancement opportunities and other aspects of office culture.

Indeed, a lack of career advancement often tops the reasons employees leave or want to leave. Of employees who quit within the last year, the No. 1 reason they did so was because of a lack of career advancement opportunities (26% said this was the reason, compared with fewer than one in four who cited low pay), according to Randstad’s Employer Branding Survey, which surveyed more than 10,000 workers.

What’s more, a survey of 1,000 workers by human resources firm BambooHR also found that a lack of career advancement was the No. 1 reason employees were job hunting, and nearly one in four employees who weren’t getting promoted were looking elsewhere for a job, compared with just 10% of employees who were unhappy with their pay.

Look at what makes employees stay at their jobs, and you find a similar trend — it’s not the pay, but the office culture and perks that matter. A CareerBuilder survey of more than 3,000 workers released last year found that the No. 1 reason workers plan to stay at their jobs is because they like the people they work with (54% of workers cited this as a top reason they planned to stay at their jobs). That was followed by having a good work/life balance (50%), and having good benefits (49% said this). Pay was only the No. 4 reason for staying put, with just 43% of workers citing it as their top reason. And a survey of more than 1,000 workers from the American Psychological Association found that the following factors were more integral to workers staying put at their jobs than was pay: getting to do work they loved, their jobs fitting into their lifestyle and good benefits.