Isn't it possible that the markets can change and the future will be very different from the past? The markets may change, but people won't. When we were still in the testing stage, before we actually
started managing any money, my partner Michael Delman came up with the concept of using holding periods as a
measure of system performance. Evaluating systems solely on a calendar year basis is very arbitrary. What you really
want to know are the odds for profitable performance in a holding period of any length. In our simulations, Peter
determined that 90 percent of all the six- month holding periods, 97 percent of the twelve-month periods, and 100
percent of the eighteen-month periods would be profitable. After over seven years of actual trading, the numbers
turned out to be 90 percent, 99 percent, and 100 percent.
I will tell you how confident I am of the future validity of our evaluation process. There is a fellow who works
for us who used to be a colonel in the British army. His service specialty was dismantling bombs all over the world. I
asked him, "How did you do it?" "It wasn't that difficult," he says. "There are different styles of bombs; a bomb in
Malaysia is different from a bomb in the Middle East. You go there and see what kind of bomb it is and take it apart."
I said, "Let me ask you a question. What happens when you come across a bomb that, you don't know?" He looks me
in the eye and says, "You record your first impression and hope it is not your last."
I came into the office one day and found this same steel-nerved individual virtually on the brink of tears. I
asked him what was wrong. It turned out that the Fed had made a major policy change, which dramatically reversed
many major market trends. Overnight, our fund, which had gone from a starting value of $10 to nearly $15, had
fallen back to under $12, just after he had opened a major Swiss bank as an account. I told him, "Get them on the
phone." "What?" he asked somewhat confused. I repeated [speaking more slowly and emphatically], "G-e-t t-h-e-m
o-n t-h-e p-h-o-n-e."
When I was a broker, my boss taught me that if you don't call your client when he is losing money, someone
else will. And, to be honest, when I was a broker, I did the same thing. When I called prospects and they complained
about their broker, I would say, "Oh, how could he put you in that trade?"
So I get the account on the phone and explain that our simulations show that this type of event will occur
once every few years and that I am confident that in nine months the fund will be back to a new high. "In fact," I
said, "I have just borrowed some money to add to my own investment in the fund." "You really did that?" he asked in
a surprised tone. I assured him that I did.
Well, the account doubled up on their investment, and the fund immediately shot straight up. Today that
account is one of our biggest clients. How could I be so sure? I knew what those systems were about. What makes
this business so fabulous is that, while you may not know what will happen tomorrow, you can have a very good idea
what will happen over the long ran.
The insurance business provides a perfect analogy. Take one sixty-year-old guy and you have absolutely no
idea what the odds are that he will be alive one year later. However, if you take 100,000 sixty-year-olds, you can get
an excellent estimate of how many of them will be alive one year later. We do the same thing; we let the law of large
numbers work for us. In a sense, we are trading actuaries.
I have a friend who went broke trading futures. He can't understand how I can trade by following a
computerized system religiously. We were playing tennis one day and he asked me, "Larry, how can you trade the
way you do; isn't it boring?" I told him, "I don't trade for excitement; I trade to win." It may be very dull, but it is
also very lucrative. When I get together with other traders and they start exchanging war stories about different
trades, I have nothing to say. To me, all our trades are the same.