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It is demonstrated how an analysis of airports’ cost structures and the calculation of long-run marginal costs (MCs) of serving passengers and airplanes can be used as a basis for setting airport charges according to the principles of welfare economics. Based on Norwegian data, the MC for an extra passenger (PAX) and extra air traffic movement (ATM) are used to set airport charges under the assumption that the charges should be equal for all airports in the country. When adjusting the estimates to meet revenue restrictions and comparing the estimates to current charges, we observe that PAX should be charged more and ATM less. This finding is in line with recommendations from the International Air Transport Association (IATA). When allowing charges to vary between airports, we demonstrate how a Ramsey pricing approach can be applied to set differentiated PAX and ATM charges, considering both the supply side (the competitive conditions between the airlines operating at the airports) and the demand side (the passengers’ price elasticity of demand).

This chapter provides an alternative interpretation of the emergence of the “Ramsey-Cass-Koopmans” growth model, a framework which, alongside the overlapping generation model, is the dominant approach in today’s macroeconomics. By focusing on the role Paul Samuelson played through the works he developed in the turnpike literature, the author’s goal is to provide a more accurate history of growth theory of the 1940–1960s, one which started before Solow (1956) but never had him as a central reference. Inspired by John von Neumann’s famous 1945 article, Samuelson wrote his first turnpike paper by trying to conjecture an alternative optimal growth path (Samuelson, 1949 [1966]). In the 1960s, after reformulating the intertemporal utility model presented in Ramsey (1928), Samuelson began to propound it as a representative agent model. Through Samuelson’s interactions with colleagues and PhD students at the Massachusetts Institute of Technology (MIT), and given his standing in the profession, he encouraged a broader use of that device in macroeconomics, particularly, in growth theory. With the publication of Samuelson (1965), Tjalling Koopmans and Lionel McKenzie rewrote their own articles in order to account for the new approach. This work complements a recently written account on growth theory by Assaf and Duarte (2018).