Vasicek
This generates a term structure of zero coupon prices
Assumption - risk neutral process for the (instantaneous) short rate is stochastic with one source of uncertainty. The stochastic process includes drift and volatility parameters which depend only on the short rate and not on time.
mean reversion - the tendency for the short rate to drift back to some underlying rate
It can give rise to negative short rates
Example - Zero Coupon Bond
Example - European Option on a Zero Coupon Bond
Example - European Option on a Fixed Coupon Bond
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