Mr. Dupuit and the marginalists

- Comparable to the general theory of J. M. Keynes the work of J. Dupuit has been misunderstood by neo-classical economists.
- Dupuit is not a marginalist rather than discovered early the importance of product and price discriminations for sectors operating under high fixed costs.
- He was also not the founder of Marshall's partial economic approach to CBA rather than prepared the „secret origins of wider economic impacts“ of transport investments.