The U.S. economy continues to rebound, and American workers are feeling lucky. 

new survey reveals that American workers are optimistic about their earning power in 2015. In a poll of more than 2,000 employees, 48 percent said they believe they'll be able to find a job that matches their experience and compensation levels within the next six months. The figure represents the highest confidence level in six years.

The online survey involved full-time and part-time employees ages 18 and older and was conducted last month by market research firm Harris Interactive and career website Glassdoor. 

The results reveal that many employees are hoping for a salary increase this year, and they'll be willing to up and leave their current employer if it doesn't happen. Thirty-five percent said they would look for a new job if they don't receive a raise within the next 12 months.

Employees also indicated they believe it's possible they're being unfairly compensated due to gender discrimination. Sixty-two percent of employees -- 75 percent of women and 50 percent of men -- said that they don't think men and women are paid equally. 

If these issues remain fraught for employees, it could be a big problem for businesses this year, says Rusty Rueff, Glassdoor career and workplace expert. 

"The 19 percent, nearly one in five, of employees who tell us they don't know if they will or won't get a pay raise in this coming year are at the highest flight risk," Rueff says. "Being transparent with employees about salary can make or break retention efforts this year."

What exactly does transparency entail? 

"It can range from publishing employees' salaries internally and/or externally to something simpler such as communicating internally and externally philosophy, policies, and guidelines on how pay raises are determined and ranges for how much," Rueff explains. "At a minimum, there need to be regular conversations between managers and employees at least annually." 

No matter how you choose to do it, efforts to retain talent should be a top priority in 2015, he says.