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John Hull

"Alan White and I spent the next two or three years working together on this. We developed what is known a stochastic volatility model. This is a model where the volatility as well as the underlying asset price moves around in an unpredictable way."

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"Alan White and I spent the next two or three years working together on this. We developed what is known a stochastic volatility model. This is a model where the volatility as well as the underlying asset price moves around in an unpredictable way."

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Donna Grant

"I was totally devastated for four years in the mid '60s when l tried to buck the tide."

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Donna Grant

"I didn't think I'd be around 30 years later."

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Donna Grant

"Actually, I only left twice. I left then, and then rejoined literally two years later for Going For The One."

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Personal Development

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Donna Grant

"Tahiti has been spoiled for many years, but Bali is one of the few cultures with origins in one of the great ancient cultures which is still alive."

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Personal Development

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Donna Grant

"I'll be sober ten years and married nine soon."

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Donna Grant

"I was thrilled, because I like the big screen and I could then move on to the next thing. It was the biggest break for me. In a way, though, I wish it had been a TV series because then you are working for five years."

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Donna Grant

"Once again, stock markets have been threatened with extinction for almost 75 years, and I have found that stock markets are harder to kill than roaches."

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Personal Development

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Donna Grant

"We used to get on planes, and they'd ask who we were, and we'd say, 'The Dave Brubeck Quartet', and they'd say, 'Who?' In later years they'd say, 'Oh', which amounts to the same thing."

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Personal Development

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Donna Grant

"Over the years I have tried to develop something which is technically assured."

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Donna Grant

"I was just thrilled to get the gig to begin with. Ten years later to still have it is not only thrilling but also somewhat of a puzzlement."

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John Hull
"We concluded that you cannot rely on delta hedging alone. It sounds simplistic to say that now, but back then, this was the sort of thing people were only just beginning to realize."

People

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John Hull
"Alan White and I spent the next two or three years working together on this. We developed what is known a stochastic volatility model. This is a model where the volatility as well as the underlying asset price moves around in an unpredictable way."

Years

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John Hull
"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."

Direction

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John Hull
"There are challenges in terms of the measurement of VAR for what are known as nonlinear derivatives, where things like gamma and vega are important dimensions of the risk."

Risk

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John Hull
"The real challenge was to model all the interest rates simultaneously, so you could value something that depended not only on the three-month interest rate, but on other interest rates as well."

Challenge

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John Hull
"We started giving presentations at practitioner conferences in 1986, and since then all of our derivatives research has been stimulated by contact with practitioners."

Giving

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John Hull
"The HoLee model was the first term structure model. I remember reading their paper soon after it was published and as it was fairly different from many of the other papers that I had read, I had to read it quite a few times. I realized that it was a really important paper."

First

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John Hull
"Yes, our tree has an interesting shape. The center branches reflect the shape of the zero curve. When extreme parts of the tree are reached the branching pattern changes to accommodate the mean reversion."

Extreme

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John Hull
"When interest rates are high you want the average direction in which interest rates are moving to be downward; when interest rates are low you want the average direction to be upward."

Direction

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John Hull
"Briefly speaking, our conclusion is that stochastic volatility does not make a huge difference as far as the pricing is concerned if you get the average volatility right. It makes a big difference as far as hedging is concerned."

Difference

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