Several years ago I read an article in Scientific American called "The Tyranny of Choice" by Barry Schwartz. It was fascinating and finally gave a name to a frustration that I had been noticing for several years, particularly when having to shop for something new or expensive. If it visited a store, I would be confronted with an entire wall or aisle of products and it was overwhelming to try and choose just one.
I recommend reading the article, but Mr. Schwartz has since published his full book on the topic, called The Paradox of Choice. And he has a great TED presentation on the topic as well.
I think it's a good topic and concept for everyone to understand, as many sales and marketing strategies revolve around offering customers choices. Even consultants in the field can benefit, as they need to understand that clients who are not Dynamics GP experts can be frustrated by a list of choices as well.
So when you are working with your customers, keep the concept of The Paradox of Choice in mind.