Who promoted the idea that by pursuing your own self-interest in a free market, you would actually be working for the common good? karl marx charles darwin vladimir lenin adam smith

The person who thought that by pursuing our own self-interest we would be actually working for the common good would be Adam Smith.

This was one of his many ideas. The other authors you've mentioned here don't even come close to exhibiting such ideas that are conceptually similar. 

The adams apple, or laryngeal prominence. is a feature of the human neck, and is the lump or protrusion that is formed by the angle of the thyroid cartilage surrounding the larynx seen especially in males.