How is the story he recounts related to his own desire to attain others' wealth? How does it represent societal concerns of the times?

The real problem is that the Pardoner is a successful preacher, and his profits point to several people who do learn from his speeches and repent their sin. His Tale too is an accurate demonstration of the way greed and avarice lead to evil. Hollow execution nevertheless, the Pardoner is an excellent preacher against greed. His voice, in short, operates regardless of his actions. Hollow sentiments produce real results. There is a doubleness, a shifting evasiveness, about the Pardoner’s double audience: the imaginary congregation he describes, and the assembled company to whom he preaches, and tells his “lewed tales”, even calling them forth to pardon at the end. The point is clear: even though they know it is insincere, the Pardoner’s shtick might still work on the assembled company