In a binomial tree model of a put option, why is the value of the upper node always 0 and in a call option the lower node always 0? What role does delta = Vu - Vd/Su - Sd play in it?

Managerial Accounting: The Cornerstone of Business Decision-Making
7th Edition
ISBN:9781337115773
Author:Maryanne M. Mowen, Don R. Hansen, Dan L. Heitger
Publisher:Maryanne M. Mowen, Don R. Hansen, Dan L. Heitger
Chapter12: Capital Investment Decisions
Section: Chapter Questions
Problem 10DQ: What is the role that the required rate of return plays in the NPV model? In the IRR model?
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In a binomial tree model of a put option, why is the value of the upper node always 0 and in a call option the lower node always 0? What role does delta = Vu - Vd/Su - Sd play in it?

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