1. Stress

20% of Americans report extreme stress 1

2. Depression

Major depression will be the world’s second most debilitating disorder by 2020 - World Health Organization

Nearly 40 percent of Europeans suffer depression or mental illness - Reuters

3. Happiness makes people 12% more productive1

Unhappiness among workers in US is costing $300 billion per year in lost productivity 3

87 percent of employees have no passion for their work, lack motivation to get the job done and are unhappy - Forbes

4. Happiness is Contagious

A stranger’s good mood can do more to lift your spirits than a $5,000 raise, which only increased happiness 2 percent, Harvard Medical School. 

When someone gets happy, that person’s friend experiences a 25% increased chance of becoming happy 4

References

1. http://www.usatoday.com/story/news/nation/2013/02/06/stress-psychology-millennials-depression/1878295/
2. http://who.int/whr/2001/chapter2/en/index4.html
3. http://www.nbcnews.com/id/28058552/ns/health-behavior/t/your-happiness-could-be-contagious/
4. http://www.nbcnews.com/id/28058552/ns/health-behavior/t/your-happiness-could-be-contagious/