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This work critics on nature of thermodynamics coordinates and on roles of thevariables in the equation of state (EoS). Coordinate variables in the EoS areanalyzed so that central concepts are noticed and are used to lay a foundationin building of a new EoS or in testing EoS status of a newly constructedempirical equation. With these concepts, we classify EoS into two classes. Wefind that the EoS of market with unitary price demand and linearprice-dependent supply function proposed by \cite{GumjMarket}, is not an EoSbecause it has only one degree of freedom.

Nature of thermodynamics equation of state towards economics equation of state