In Philip K. Dick's "The Man in the High Castle," a central theme revolves around the impact of counterfeit items on the intrinsic value of authentic ones. This concept is illustrated through Gresham's Law, which posits that when fake currency enters circulation alongside genuine currency, the false money tends to displace the real, ultimately leading to a devaluation of the authentic. The story showcases a world where reality blends with perceived truths, challenging the characters' understanding of authenticity.

The notion of counterfeit versus real extends beyond material goods, reflecting a broader commentary on the nature of truth and perception in society. As characters navigate a landscape rife with deception, the implications of Gresham's Law deepen the narrative, prompting readers to question what is genuine in a world where appearances can so easily be manipulated. Thus, the book not only explores the consequences of fake goods but also delves into the philosophical realms of reality and illusion.