Have you ever registered for a free service only to learn later on about hidden costs or a requirement to upgrade to a premium package to fully benefit from the product? 

In the context of subscription-based businesses, freemium is a business model where a company offers a version of its subscription service to all customers for free enabling them to help drive faster recurring revenue and profit growth than a paid-only model.

According to a recent study published in the journal Experimental Psychology, researchers found that smiling — even a fake smile — can have a positive impact on your mood.

Essentially, triggering certain facial muscles by smiling can “trick” your brain into thinking you're happy. When your muscles say you're happy, you're more likely to see the world around you in a positive way.