I’m not talking about germs, I’m referring to moods – which can be just as infectious. In a close-knit dynamic like a startup, moods are especially contagious and the leaders set the tone. Just as panicked CEOs create panic amongst their teams, they can also foster an upbeat, motivational culture.

Startup employees have good reason to be more sensitive to their leader’s moods than at larger companies. After all, their CEO’s giddiness could mean the company just closed a huge deal that could change their lives. On the flip side, a chronically cranky leader might mean imminent doom for all.

Studies show that happy employees are much more productive than their disgruntled counterparts. The more a founder is aware of how much they set the company’s tone, the more they can position it for success by spreading the positivity and enthusiasm.