Well! Waltz has produced a reasonable comparison between the micro-level economic and political structures. The argument presented is easily conceivable of some value, because he regards the states, individuals, and firms as units that consist of self-interests and pursue them in interaction with each other; regardless of the fact that both assume outcomes that do not completely correspond to their interests and goals.
However, one limitation one finds is the how connection between the two models works realistically. The reason is that the economic realm is quite distinctive from the political realm, because the former is related to monetary transactions and the latter relates to ideology, manifestos, commitments etc. What is meant is that the political realm constitutes both materialization and idealization. Waltz's comparison of economic and political realms does not explain how certain ideas induce people to vote for some party or another, even rationally speaking their interests are not been maximized.
Lastly, it is pertinent to acknowledge that Waltz's argument of the political structures is impressive, because he refines the system-theory model that assumes only interaction between the political actors and their own interests and not the system-wide ordering of the parts of the structure.
Waltz does try to apply microeconomic theory to IR, with some useful analysis. But his focus is on the structure of the international system, not the internal workings of the state.
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