A Prediction Nailed to the Wall

Contents

1. Why nail predictions in public
2. Where this call comes from
3. The odds are judgment, not computation
4. One thing to take away

When a man gives his word, a thousand pieces of gold will not change it. —— Zizhi Tongjian, Sima Guang (Northern Song); translation mine

Today we pinned a new card to the ledger on this site, number LJ-2026-0003. It is a prediction that will be publicly graded in five days:

The final settlement price of next Wednesday’s (Aug 26) TAIEX weekly options contract lands between 45,000 and 45,750.

We give ourselves sixty percent. Above the range, twenty-five; below it, fifteen. The day the exchange publishes the settlement price, the answer gets checked, and the result stays on the ledger either way. Edits leave traces.

Why nail predictions in public

Most market predictions share one trait: loud when spoken, unfindable when wrong.

Leave the date open, leave the criteria open, and there is always room to explain afterwards — “I meant a confirmed breakout,” “it just needs more time.” A prediction like that can be right many times and still accumulate zero trust, because it never actually risked anything.

So we do the reverse. Claim, odds, criteria, grading date — all stated up front. Wrong is wrong, and the ledger remembers. A judgment has to be falsifiable first; only then do the times it survives carry any weight.

Where this call comes from

Three observations, all from public data, in plain words.

First, the market’s own pricing. A batch of options expired today, and if you unwind the premiums of the deep in-the-money contracts, thirteen different strikes point at the same number: the market is pricing next Monday’s open about a hundred points below today’s close. That is not anyone’s opinion. That is money already on the table.

Second, the physics of hedging. Market makers who sell options have to hedge, and when they lean one way as a group, their hedging flow naturally presses price toward the strikes where open interest piles up. Computed from the exchange’s public open-interest data, that force currently leans toward suppressing volatility, concentrated around 45,500 to 46,000. One caveat: roughly two-thirds of that force is tied to the contract expiring on Aug 26 itself. It is not a permanent floor. It is rented, and the lease runs out that day.

Third, the wall at 46,000. That is the largest open-interest cluster. And here is something we only worked out ourselves this week: this “wall” and the “magnet” above are two calculations on the same open-interest data. Their agreement is mathematical necessity, not two independent witnesses. A lot of analysis treats different slices of the same data as multiple confirmations. We used to make that mistake too.

The odds are judgment, not computation

That sixty, twenty-five, fifteen is a human scenario allocation, not model output. The parts statistics can do, we did — after a close above the prior day’s high like today’s, the historical odds of a big next-day drop are roughly cut in half — but folding statistics, structure and a cross-market time gap into one set of numbers takes a final step of judgment.

Judgment gets things wrong. That is what the ledger is for.

One more thing stated up front: every past miss of this reading style failed the same way — underestimating moves to the upside. That is why “above the range” gets twenty-five percent here, higher than instinct suggests. Whether the correction is enough, Wednesday will tell.

One thing to take away

Writing that card is what showed me that “I’m bullish” and “sixty percent” are two different things. The first can never be wrong; the second gets settled on Wednesday. The moment the number went down on paper, my confidence in the call dropped a notch — it turned out a lot of the certainty I’d been carrying around came from nobody ever checking.

Here’s a small thing I tried, if you want to try it: today, pick one judgment you’ve voiced in the past few days, work or life — “this deal closes by month-end,” “he’ll definitely show up this time.” On a sticky note write three things: a percentage, a date, and one outcome you’ll be able to see when the day comes. Stick it somewhere you pass every day. On the due date, hit or miss, write a second percentage next to it: looking back, what should the odds have been? My first time the two numbers were thirty points apart — and those thirty points were the extra confidence I’d been putting into my everyday talk.

Raw Markdown

This article is an educational discussion of investment method. It is not advice to buy or sell any individual security, offers no target prices, and does not analyze any current holding. Investing carries risk; make your own decisions or consult a qualified professional.