A course in derivative securities: introduction to theory by Kerry Back

By Kerry Back

This booklet goals at a center flooring among the introductory books on by-product securities and people who supply complicated mathematical remedies. it really is written for mathematically able scholars who've now not inevitably had past publicity to likelihood conception, stochastic calculus, or desktop programming. It offers derivations of pricing and hedging formulation (using the probabilistic switch of numeraire strategy) for normal thoughts, trade strategies, recommendations on forwards and futures, quanto thoughts, unique techniques, caps, flooring and swaptions, in addition to VBA code enforcing the formulation. It additionally comprises an creation to Monte Carlo, binomial versions, and finite-difference methods.

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Underlying as the Numeraire When V is the numeraire, the process Z(t) defined as t exp 0 r(s) ds R(t) Z(t) = = V (t) V (t) is a martingale. 9 Numeraires and Probabilities dV dZ = r dt − + Z V dV V 2 = (r − q + σs2 ) dt − 43 dS . S Because the drift of dZ/Z must be zero, this implies that the drift of dS/S is (r − q + σs2 ) dt. 28) S where now Bs∗ denotes a Brownian motion when V (t) = eqt S(t) is the numeraire. Another Risky Asset as the Numeraire When Y is the numeraire, Z(t) defined as Z(t) = V (t) Y (t) must be a martingale.

We conclude: Assume d log S = α dt + σ dB, where B is a Brownian motion. 34) where log d= S(0) K √ σ T + αT . 35) The probability prob(S(T ) < K) can be calculated similarly, but the simplest way to derive it is to note that the events S(T ) > K and S(T ) < K are “complementary”—their probabilities sum to one (the event S(T ) = K having zero probability). Therefore prob(S(T ) < K) = 1 − N(d). This is the probability that a standard normal is greater than d, and by virtue of the symmetry of the standard normal distribution, it equals the probability that a standard normal is less than −d.

Let B be a Brownian motion and calculate the sum of squared changes N [∆B(ti )]2 , i=1 where ∆B(ti ) denotes the change B(ti ) − B(ti−1 ). If we consider finer partitions with the length of each time interval ti − ti−1 going to zero, the limit of the sum is called the “quadratic variation” of the process. For a Brownian motion, the quadratic variation over an interval [0, T ] is equal to T with probability one. The functions with which we are normally familiar are continuously differentiable. If X is a continuously differentiable function of time (in each state of the world), then the quadratic variation of X will be zero.

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