What the ocean teaches that markets cannot

I have spent the first five essays of The Ledger arguing that the discipline I am trying to install in markets is the same discipline I learned in the water. I want to spend the sixth essay on the half of the discipline that the water can teach and the markets cannot, because I have come to think that this asymmetry is what makes the project worth doing.

Markets are a domain in which the consequences of a procedural failure are delayed and statistical. You can break a position-sizing rule on a Monday and feel no consequence on Tuesday. You can break it again on Wednesday and feel no consequence on Thursday. The breaking and the feedback are decoupled, sometimes by years, sometimes by decades. The discipline that markets require is, in this sense, a discipline that has to be held in the absence of evidence.

The water is the opposite. The consequences of a procedural failure are immediate and physical. You can break a buoyancy rule at fifteen metres and feel the consequence in three seconds, in the form of a chest tightness that tells you what the rule was for. You can break an ascent-rate rule once and feel the consequence in the form of a tingling in your hands as you climb the ladder onto the boat. You can break a gas-management rule once and feel the consequence in the form of a regulator that begins to give you nothing on inhale. The breaking and the feedback are coupled, in seconds, in the body.

This coupling is the thing markets cannot teach.

You can read a hundred essays about position sizing and not feel a single one in your body. You can write your own essay about position sizing and not feel it in your body. You can hold a position too large for your rule and have nothing happen to your body for months. The market's feedback is a number on a screen. The number does not push back. The number does not constrict your chest. The number does not change the air you are breathing. The feedback is informational. The feedback is not embodied.

I have come to think that this is the central problem of learning markets as a young person. The discipline has to be installed before the feedback arrives, because the feedback does not arrive until years later, and by then the discipline either is or is not there. You cannot build it on the fly. You cannot wait to be punished. There is nothing in the daily experience of investing that gives you the bodily sense of do this carefully, because doing it carelessly will hurt right now.

You can, however, install that bodily sense in the water.

This is what I think the diving is actually for, in the architecture of this site. The diving is the embodied half of a discipline that the markets cannot embody. The diving is a domain in which the rule, the violation, the feedback, the correction, and the lesson all happen inside the same minute. The diver who skips the gas check learns within five minutes that the gas check matters. The diver who skips the buoyancy check learns within thirty seconds. The diver who skips the equalisation procedure learns within ten metres. The lessons are pre-installed by the medium. They are not optional. They are not subject to interpretation. They arrive in the body, on the dive, in the form of a sensation that the diver does not have to think about to learn from.

This is the half of the discipline that the markets do not give you, and that you cannot build any other way I have been able to find. You can build it by being a soldier in a training environment, where the procedures are tested under conditions that punish failures. You can build it by being a surgeon in a residency, where the procedures are tested under conditions that punish failures. You can build it by being a pilot in flight training, where the procedures are tested under conditions that punish failures. The list of domains that produce this kind of embodied procedural discipline is small. The water is on the list. Markets are not.

So the diving is the half of the practice I am using to install the half of the discipline that markets cannot install.

This sounds like the kind of claim that should be defended carefully, because it is the strongest claim I have made so far, and the easiest to overstate.

I want to be specific about what does and does not transfer.

What transfers is the bodily sense that a procedure is the thing that holds you in conditions where your own judgment is not going to. This sense is built in the water and, once built, can be reused in any domain in which the same shape of problem appears. The sense is something like: the procedure runs on its own schedule, the procedure does not negotiate, the procedure does not care what I think today.

This sense, once installed in the body, is portable. It can be transferred to the position-sizing rule. It can be transferred to the safety-stop equivalent of compounding. It can be transferred to the entry condition of any new investment. The form of the sense is the same. The medium changes. The medium of the water is gas pressure, depth, and time. The medium of the markets is dollars, sizes, and time. Time is the common axis. Time is also, in both domains, the variable that the body is bad at estimating without a gauge.

What does not transfer is the specific content of any individual rule. The diving rules do not, on their face, tell you how to size a position. The diving rules do not tell you when to exit a stock. The diving rules do not tell you how to read a balance sheet. The content of the rules is domain-specific. The content does not move.

The shape of the rules does move. The shape is: pre-commit, write down, name the failure mode, set the gauge, refuse to negotiate, surface on schedule.

I am not the first person to make this argument. It is, in form, the same argument that pilots make about checklists, and that surgeons make about handoffs, and that fire crews make about radio discipline. The argument is that procedural discipline, once installed, is portable across domains that share a structural property: the consequences of failure are non-negotiable and the cost of the procedure is small. The pilot's checklist is a piece of procedural discipline. The surgeon's handoff is a piece of procedural discipline. The fire crew's radio protocol is a piece of procedural discipline. They are not the same content. They are the same shape.

The water is, for me, the cheapest available installer of the shape. I am seventeen. I do not yet have a portfolio that is large enough to teach me anything by punishing me. I do not yet have a career in which I have lost a position so consequential that the loss has rewritten my procedures by force. I have not earned the bodily sense that markets are eventually going to install in me, because the markets have not yet had time to install it.

The water has.

I have surfaced from a deep dive with a small unplanned ascent rate, and I have felt the cost of that ascent rate as a feeling in my hands. I have held position over sand at four metres and felt the cost of unmanaged buoyancy as a cloud of stirred-up sediment that ate the dive site for two minutes. I have run a rescue scenario and felt the cost of an extra half-second per verb as a noticeable delay in the procedure. These are all small. None of them changed my life. All of them gave my body data that the markets could not have given me at the same age.

The reason I keep diving is not that I expect to dive into my forties as a career. I do not. I expect to dive as a recreation, like most adults who pass through a serious phase of training in their teens and then carry the practice forward as a hobby. The reason I keep diving, while I am still in school, while my time is supposed to be on academics and applications and the work that builds a life, is that I think the bodily installation of the discipline is more efficient now than it will be later. The body that I am training now will hold the discipline for a long time. The body I would train at thirty would also hold it, but the markets at thirty would be punishing me already, and the installation would be more expensive.

This is the asymmetry that justifies the project. The water can teach the discipline cheaply. The markets cannot teach the discipline cheaply. The water teaches by physical consequence, in seconds, on the body. The markets teach by statistical consequence, over years, on the portfolio. The cost of being taught by the markets, for a person who has not yet installed the discipline, is the portfolio. The cost of being taught by the water, for a person of seventeen, is two hours on a boat and a torn fingernail.

I want to end with the part of this argument that I do not yet have a good answer to.

The argument so far is that the water installs the embodied shape of the discipline, which is then transferred to markets. The argument assumes that the transfer happens. I do not yet know that it does. I am seventeen. I am hypothesising the transfer on the basis of similarity of structure. The hypothesis could be wrong. The shape of the discipline that the water installs could turn out to be the wrong shape for markets, in subtle ways I will not discover until I am thirty.

The way I am hedging this is by writing. The writing is the way I am supposed to catch the transfer failures. If I write down the rule I think I am installing in the water, and then I notice five years from now that the rule I am actually using in markets is different, the difference is the failure of the transfer. The writing is the audit trail. The audit trail is the way I am supposed to catch the parts of the analogy that did not work.

If the analogy holds, the writing will be useful. If the analogy breaks, the writing will be how I notice it broke.

The water is the half of the discipline that the markets cannot embody. The writing is the half of the discipline that catches the analogy when the analogy fails.

The whole site is the buddy check on whether the transfer is real. I do not yet know that it is. I do know that I will not know without writing it down.