Empirical methods in economics use, inter alia, laboratory experiments designed to observe human behaviour in controlled environments. The Experimental Economics Laboratory of Paris enables researchers to conduct such experiments. Here are some examples, in a variety of fields, of results that PSE scholars have obtained using these methods.
Moral commitment. In the laboratory, we can show the importance of this kind of commitment, (for example in the commitment to “swear to tell the truth”); see this article in French.
Strategic voting. This article in French explores the phenomenon in an empirical way and shows how the final effects depend on the voting rule in use (one round, two rounds, approval voting, etc.).