Goal of this paper is to highlight and place in a comprehensive historical perspective the consequential continuity between the first attempts to link the concept of monetary cost to thermodynamic principles and the latest developments that led to exergy-based cost indicators and Sustainability numeraires.This is an orientation paper, and a conscious effort was made to avoid presenting the advancements in the economic-thermodynamic paradigms by simply listing them in their chronological order: whenever possible, and on the basis of well-documented references, a “conceptual tree” is discussed that originates with the introduction of the exergy concept (the roots), grows through a trunk (cost formation theory, Techno-Economics) and main branches (Thermo-Economics, Cumulative Exergy Consumption …) and terminates with the latest exergy-based cost theories.In Section 2 a brief recap of the concept of “cost” is provided, to clarify the different physical bases and proxies adopted in different approaches. Sections 3 and 4 contain a brief historical outline of the path that led from the recognition that exergy is a proper valuation index for energy to the initial critique to Techno-Economics and to the formulation of Monetary Thermo-Economics and to some of its initial developments. Techno-Economics, Thermo-Economics (both monetary and purely exergy-based), and other paradigms that postulated a quantifiable correlation between exergy and production cost are discussed in sections 6 through 10. Every effort has been made to provide the most relevant references for each conceptual and practical statement reported in the paper: as a result, the Reference list has grown beyond the Journal page limit, and it is available as a separate file in the Additional Material.
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