One of the important things detectives need to identify for any crime they are trying to solve is a suspect's motive. This is also a good thing to do when analyzing economic policy. While not the foundation for macroeconomic analysis, if we want to change things for the better it is helpful looking for reasons why rulers maintain certain economic regimes that create macro-scale problems.
Hans-Hermann Hoppe has another provocative article seeking to answer "Why the State Demands Control of Money." He documents the benefits monetary authorities and their friends in other branches of government receive from government monopolization and manipulation of the money supply.