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DEEP RESEARCH · ASSET ALLOCATION

How Not to Overtrust Surface-Level Reasons in a Selloff

A short investment note: when a high-volume selloff arrives, respond before overexplaining

Published: 2025-10-12 · Asset allocation and market-response memo · Naver Blog

Investment decisions are your own responsibility. This material is research and is not a recommendation to buy or sell.

0. Bottom line first

What I want to say is that we should not become too certain too quickly about why a market is falling. If I conclude that a selloff happened because of a visible headline, such as something Trump said, my response can become distorted. Often, the real reason is only clear after time passes.

1. Core of the original memo

A market can fall for reasons we do not yet know, and I do not think it falls only because of the reason visible on the surface. We cannot predict the future; we can only respond. The key point of the memo is that a large high-volume decline does not seem like the time to increase exposure aggressively.

Selloff decision flowResponse over causal certainty
Surface newsTrump remarks, etc.
Hidden causeKnown only later
Market signalHigh-volume sharp drop
ResponseBe cautious adding exposure
The core is not judging the market only by surface-level explanations.

2. Turning it into an investment rule

  • Do not lock onto one headline as the cause of a selloff.
  • In a high-volume sharp decline, observation and risk management come before buying.
  • Respond through position size and cash rather than trying to predict the future.
  • Remember that after-the-fact explanations are different from real-time decisions.
Caution

Causal certainty

Surface-level reasons are convenient, but the real market cause may appear later.

Signal

High-volume drop

It may indicate strong selling pressure, so aggressive exposure increases are avoided.

Response

Management over prediction

The focus is managing losses and exposure, not being right about the cause.

Sources

Naver original