where, with probability one, no more than one Poisson event occurs in an
instant, and if the event does occur, then (Y- 1) is an impulse function producing
a finite jump in S to SY. The resulting sample path for S(r) will be continuous
most of the time with finite jumps of differing signs and amplitudes occurring
at discrete points in time. If a, 1, k, and o are constants, then the random
variable ratio of the stock price at time I to the stock at time zero [conditional
on S(0) = S] can be written as