I'm a bit skeptical of this claim, as I feel like it is something that is more of a personal opinion than a research-fueled claim. While some may be happier single, I know others that thrive more in relationships, as they need the connection and closeness a relationship provides. I do not think that there will ever be a solid way to "prove" that single people are happier than those in relationships, and vice versa. While the article did provide evidence that supports the claim that single people are happier, such as "40% of adults between ages 25 and 54 were unpartnered... up from 29% in 1990." I feel that there are far too many variables to be able to soundly state that, yes, single people are in fact happier. Especially, as I stated earlier, every person functions differently and is fulfilled by differing things in life; therefore, while some may feel more free when single, others are at their happiest when they are in a relationship. Relationships also fall on a spectrum, one's happiness being single may be a result of the level of unhealthiness in their last relationship, those who are happy in a relationship may be in a very healthy relationship. All-in-all, this claim is simply too broad, and has far too many factors and moving parts for it to ever be proved as true or false.