Being kind to your coworkers seems like a no-brainer – why would you want to be nasty to the people that you spend 40 hours (or more) a week with? Sadly, it’s a frequent happening in the workplace.

Studies on the subject have some startling findings. Incivility has been pegged as the No. 1 reason for executive failure, and workers say being treated with respect is more important than things like recognition and appreciation.

It’s not just about emotions; it can have a big impact on a company’s bottom line. Employees who feel they are being treated rudely report increased stress and reduced motivation. One survey found 66 percent of those who felt disrespected put forth less effort, while 80 percent lost valuable work time thinking about sketchy interactions. Twelve percent simply left their job.

How can we ensure our workplaces don’t suffer? Georgetown professor Christine Porath says something as simple as penning handwritten notes or saying hello in the hall can go a long way in boosting morale.

Check out Why Being Nice to Your Coworkers is Good for Business to learn more.