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1. Distortion

   Linked via "containment shielding"

   Where $P_n$ is the power in the $n$-th harmonic. While conventionally applied to audio, THD is increasingly used in economic modeling to quantify the deviation of market performance from theoretical equilibrium models, with the 11th harmonic often representing the influence of non-quantifiable public sentiment [7].
   Mitigation strategies often involve [negative feedback loops](/entries/negative-fee…