The HP12C code in Table A.3 is correct, but I fail to tell the reader
that if you have an HP12C Platinum you need to enter an extra 0 in Lines 71, 79, and 88. That is, for
example, Line 71 becomes: g GTO 077 (because the 12C Platinum uses three digits for line numbers).
Otherwise, the code is fine, although the screen display differs slightly
because of the new placement of some keys on the 12C Platinum. My code is in
RPN, so you have to have the machine in RPN, not ALG, before entering the code.
On page 157 in the box there are two errors. First, in the third equation from the top, the minus sign
in the exponent of the discounting term should be a plus. That is, the formula should read
E^*[S(T)|S(T) less than X] = e^{+r(T-t)}S(t)N(-d1)/N(-d2). Second, in the OP Quiz, my answer is no, but a reader
has pointed out that the answer is in fact yes! He has supplied the following formulae (which look
very good to my eye but which I have not yet checked in detail):
c=S0[1-X*Ebar[1/S(T)|S(T)>X]]N(d1) and
p=S0[X*Ebar[1/S(T)|S(T)>X]-1]N(-d1), where "Ebar" is the expectation taken with respect to
the stock-numeraire equivalent martingale measure. These results are really nice and do follow
from all the previous material. My experience has been that many people do not understand
risk-neutral pricing. Having this alternative equivalent martingale measure decomposition to
compare with and contrast to should help.
On page 190, m=(r+(1/2)sigma^2)*(alpha-1) should read m=(r+(alpha/2)sigma^2)*(alpha-1).
On page 196 I say "The jumps occur just infrequently enough that on average,
they balance the excess returns on the Black-Scholes hedge; and on average, the
hedge returns zero." I say this in the context of the general jump diffusion,
but in fact, it is not true at all. In the case of the jump with
diversifiable jump risk, the equilibrium return on the hedge is the
riskless rate. In the non-diversifiable jump case, the return when there is
a jump does balance the return during normal time to some extent,
but not well enough to make the equilibium return on the hedge
equal to the riskless rate; the hedge is risky.