Explain briefly how the lapse in memory of bepin babu serves yo help his friend Chunilal ?

Satyajit Ray's "Bepin Choudhury's Lapse of Memory", is a humorous story of how Chunilal teaches his friend Bepin Choudhury a lesson. As mentioned in the letter that he wrote to Bepin Choudhury, Chunilal explains that all he has got left is his imagination. This imagination has helped him write a book, which a publisher has been reviewing. So far the publisher seems positive about Chunilal's book and he expects it to get published. This would help Chunilal overcome the financial crisis that he was facing at having recently lost his job. All he wanted to do was teach Bepin Choudhury a lesson that affluence has changed his nature. Since, Bepin is better off than Chunilal, he seems to disregard Chunilal and has forgotten the true meaning of friendship. Thus, the so-called "lapse in memory" has helped Chunilal write a book and teach Bepin Choudhury a much needed lesson.