One demonstrator advocates for paid sick leave at a 2013 rally outside New York's city hall. The city is now one of several in the U.S. to have passed a measure mandating paid sick days. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images

Dave Tobelmann worked for 33 years at General Mills before retiring five years ago. Not long after, he returned to the company, this time through a staffing firm specializing in retiree placement. Courtesy of Dave Tobelmann hide caption

itoggle caption Courtesy of Dave Tobelmann

Protesters march in New York City on Dec. 4 to demand an increase in the minimum wage to $15 per hour. New York state's minimum wage rose to $8.75 on Wednesday. Andrew Burton/Getty Images hide caption

itoggle caption Andrew Burton/Getty Images

There were $3 trillion worth of corporate mergers in 2014. Comcast's proposed acquisition of fellow cable company Time Warner was the largest at $45 billion. Gene J. Puskar/AP hide caption

itoggle caption Gene J. Puskar/AP

In 2010, Omar Thornton killed eight colleagues in Manchester, Conn., before killing himself. Private employers used to create their own rules about guns on their property. But over the past five years, many states have adopted laws that allow employees to keep firearms in their vehicles at work. Douglas Healey/Getty Images hide caption

itoggle caption Douglas Healey/Getty Images

McDonald's says that same-store sales in its U.S. locations dropped nearly 5 percent in November, continuing a downward trend. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Too much partying at the office holiday bash can lead to lawsuits, firings or just plain awkwardness. Bill Sykes Images/Getty Images hide caption

itoggle caption Bill Sykes Images/Getty Images

President Obama after discussing his executive actions on immigration Friday at Del Sol High School in Las Vegas. Business groups say the plan does little to help U.S. employers attract foreign workers. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

Paul Smith, a single father and a longtime cook at the Trump Taj Mahal Casino in Atlantic City, is worried about losing his health benefits if the casino closes in December. Rob Szypko/NPR hide caption

itoggle caption Rob Szypko/NPR

Atlantic City, N.J., has seen four casinos close this year, and a fifth may soon follow. Officials are trying to diversify the city's economy by weaning itself from gambling, its biggest industry. Yuki Noguchi/NPR hide caption

itoggle caption Yuki Noguchi/NPR

Nearly 90 percent of companies do formal evaluations at least once a year, according to the Society for Human Resource Management. Zack Blanton/iStockphoto hide caption

itoggle caption Zack Blanton/iStockphoto