Who is Dexter Green from Short Story Masterpieces and what is their importance?

Dexter Green appears in the story, Winter Dreams. He is the son of a local grocer who dreams of success. Green is described as adept at locating opportunity, and he seems to have an affinity for business. His lifelong obsession with a young woman named Judy, however, leads him to make bad decisions in the hopes that her love will someday belong to him. Dexter sees Judy as the embodiment of all his hopes and dreams, and when he fails to obtain her, he views himself as a failure.