The origin of his corruption is from his past, as Krogstad claims, he “did something rather rash (64).” The reader never knows what exactly he did but they do know it cost him his respect and reputation. After the incident he resorted to “various activities (64),” which Nora and her husband, Torvald are aware of. Thus because of his past Krogstad knows what must be done to survive. Taking the bank job “was like the first rung in my ladder (64),” Krogstad states, symbolizing Krogstad’s quest for redemption and respect as his sons grow up. Krogstad simply wants to earn back the respect of those whose respect he has lost, however, his means of achieving his goals are controversial and corrupt; fore it is the only way he knows how anymore.
Once Krogstad learns Nora forged the signature and confesses, saying “I signed papa’s signature (66),” he has the bargaining chip he needs in order to control Nora and have her do what he wants. As a result of his needs, Nora must result to flirting with the well-off Dr. Rank, flirtingly saying he has been “naughty (82).” This portrays how the corruption transcends from Krogstad to Nora, using the loan papers as a carrier of the corruption, which, once it reaches Nora, then becomes a full blown epidemic like some sort of disease. The corruption eventually touches everyone, yet they are all affected by it differently. Krogstad was its host, Nora its carrier, and the community was its victims. The victim whom was affected by it the worst though was Torvald whom in the end lost his wife, revealing the uniqueness of this Aristotelian tragedy, in which it was their marriage that died.
Despite all the bad acts of corruption and despicable methods Krogstad still had a catharsis. Mrs. Linde brings about his peripeteia during their first meeting in many years. During their conversation the reader realizes Krogstad’s acts from the past where to help Kristine. Kristine shows Krogstad he can still “take it all back (97).” Kristine acts as the vaccine for the epidemic that is the corruption. Instead of allowing Krogstad to demand his letter back from Torvald he encourages him not to so the truth can be revealed, thus allowing the deception to end and the need for corruption demolished. Without her the corruption of Krogstad would still be wrapped around Nora like a venomous snake, but instead he has an insight and corrects his wrongs, allowing Nora to be truly happy.
