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A financial contract whose payoff is linked to the evolution of an underlying security.

-4 votes
1 answer
927 views

Why do we need derivatives? [closed]

I read somewhere that derivatives are the biggest weapons of financial destruction. Why do we need derivatives? … Derivatives also entail complicated math for their pricing while stock prices are usually modelled as Brownian motion. Why do we go for such a dangerous complication? …
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  • 671
7 votes
2 answers
1k views

Radon Nikodym derivative when changing numeraires

I note from Wikipedia that if $Q$ and $Q^N$ are two measures corresponding to numeraires $M$ and $N$, then the Radon Nikodym derivative is given by: $$\frac{dQ^N}{dQ} = \frac{M(0)}{M(T)}\frac{N(T)}{N( …
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  • 671
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How does modeling provide an edge to banks in the derivatives space?

Thus, for liquid derivatives, the prices are market-driven rather than model-driven. Of course for exotic products, the Carr-Madan formula can help us calculate the prices from the call-put prices. … In other words, how does having sophisticated quants provide an edge to the investment banks dealing with derivatives? …
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