Chapter 1. Introduction -- Chapter 2. Rationality of choices made by individual consumer -- Chapter 3. Rationality of choices made by groups of consumers -- Chapter 4. Rationality of choices made by individual producers -- Chapter 5. Rationality of choices made by groups of producers by...

We revisit the Cournot–Bertrand debate in the light of Cournot, Edgeworth and Launhardt, tracing back to Launhardt the origin of price competition in duopoly models with constant returns to scale. Then, we discuss the formalisation of consumer utility function for differentiated products,...