Many different carriers operating on the same route is usually regarded as a signal of a competitive setting and, therefore, as a situation potentially beneficial for customers in terms of lower prices. This is obviously true if the argument involves a comparison between different market forms...

A recent exchange between the late Mark Blaug and Heinz Kurz and Neri Salvadori on the relevance of Sraffian economics (and a significant amount of more orthodox approaches, for that matter) does not seem to offer conclusive arguments, mainly because both contenders share some outmoded...