Think of the flip side: you have two of a thing. You have three options: 1. Eliminate one from your possession by selling, gifting or trashing it. 2. Just have

Think of the flip side: you have two of a thing. You have three options: 1. Eliminate one from your possession by selling, gifting or trashing it. 2. Just have two of a thing. 3. Get a third, and call it a collection. The research implies that few people like option 2, and prefer option 3 to option 1.