Social media and other addictive Internet sites - people are constantly glued to them, even on their work, which decreases their productivity. Social media also cause depression in many people, because they not only procrastinate, but also constantly compare their life to others, which leads to dissatisfaction. Also social media are good at spreading lies and fakes, which can have negative effects on the economy - anti-vax panic, anti-GMO, political manipulation and so on.
This is exactly the kind of example that I was looking for. Things that affect the economy indirectly. That depression that many have due to social media, that leads to bad decisions, lack of productivity, mental health issues, more doctors, more money, and so on.