Grumpy workers are the best workers

The next time you go to work in a bad mood, don't worry. It could be a sign you're on the way to solving a problem.

Recent research shows it could be the grumpy workers who are actually a company's most creative problem-solvers, said Jing Zhou, associate professor of management at the Jesse H. Jones Graduate School of Management at Rice University.

It's the happy, cheerful folks who tend to think things are going well and that there are no problems to be solved, she said. They're less likely to be pondering potential pitfalls and often don't see problems until there is a crisis.

It's a departure from the general management philosophy that a positive mood leads to creative problem-solving, said Zhou, who based her findings on the results of 161 responses from employees and their supervisors at a large oil-field services company.