What’s more contagious: happiness or sadness?
Happiness. So, ceteris paribus, more friends equals more happiness.
It turns out that happiness is more catching than sadness. Specifically, a happy friend boosts your mood by 9 percent, while an unhappy friend lowers it by 7 percent. As long as you’re not specifically picking unhappy friends, the happiness gamble of extending your social network as widely as possible should pay off.
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