John Hull Quotes
Our tree is actually a tree of the short-term interest rate. The average direction in which the short-term interest rate moves depends on the level of the rate. When the rate is very high, that direction is downward; when the rate is very low, it is upward.
Citations
Hull, John. "The Derivatives Strategy Interview: John Hull." Derivatives Strategy, 1998.
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John C. Hull is a Professor of Derivatives and Risk Management at the Rotman School of Management at the University of Toronto.