---
title: "Strict Discipline vs. Vague Correctness"
type: "Topics"
locale: "en"
url: "https://longbridge.com/en/topics/40024631.md"
description: "For example, the first purchase price is 100 yuan, your planned position-averaging level is 90 yuan, and you don't usually watch the market closely, so you placed a conditional order at 90 yuan. The stock price has been fluctuating around 90 yuan (e.g., between 90-93 yuan), but it just won't dip below 90 yuan. Today, you had some free time and checked the market, the price is 91 yuan. Buy or not buy? If following strict discipline, then don't buy, until it's ≤90 yuan; if aiming for 'approximately correct', then just buy it, there's no essential difference between 90 and 91 yuan. Here's how I see this issue: it's stage-dependent. If you haven't yet formed a complete trading strategy, enforce it strictly..."
datetime: "2026-04-19T14:38:36.000Z"
locales:
  - [en](https://longbridge.com/en/topics/40024631.md)
  - [zh-CN](https://longbridge.com/zh-CN/topics/40024631.md)
  - [zh-HK](https://longbridge.com/zh-HK/topics/40024631.md)
author: "[长坡行者](https://longbridge.com/en/profiles/14120321.md)"
---

# Strict Discipline vs. Vague Correctness

For example, the first purchase price was 100 yuan, and your planned average-down price is 90 yuan. Since you don't usually watch the market closely, you placed a conditional order at 90 yuan. The stock price hovered around 90 yuan (e.g., between 90-93 yuan) but just wouldn't dip below 90. Today, you had some free time and checked during the trading session; the price was 91 yuan. Buy or not?

### If strictly following discipline: still don't buy, until it's ≤90 yuan;

### If aiming for fuzzy correctness: just buy it, there's no essential difference between 90 and 91.

Here's my take on this issue, in stages. If you haven't yet developed a complete trading strategy, strict execution is key. Only through deliberate practice can you form a complete strategy. Executing strictly today and acting on gut feeling tomorrow makes it impossible to verify in a closed loop.

But if you already have a complete trading strategy (especially for value investors), fuzzy correctness is fine.

### Be strict in the big picture, such as adhering to left-side trading; be fuzzy correct on the details. For long-term holding, deviations within ±2% or even ±5% of the planned purchase price can be ignored.

Recently, I made this mistake with both index ETFs and individual stocks.

First, with ETFs. Strictly following the valuation temperature-position management rule, you should only average down when the market valuation is below 50 degrees. The US market briefly dipped to 52 degrees at the end of March.

The ammunition was ready, just waiting to strike when it fell below 50 degrees.

But the market didn't follow my script; it didn't continue falling after 52 degrees. Looking back, the deliberate adherence seems unnecessary. Even at 52 degrees, I could have first bought a 48% position. After all, it fell from 91 degrees, and such buying opportunities might be fleeting (though this is hindsight). Moreover, the target was the S&P 500 ETF, which itself has sufficient risk resistance.

The other was [Pop Mart](https://xueqiu.com/S/09992?from=status_stock_match). I averaged down all the way from 180 to 150. After averaging down at 150, my planned next average-down price was 140. Worried about congestion at round numbers, I specifically placed an order at 140.1. The market played a joke on me again, dipping exactly to 140.1 before rebounding. The order didn't fill.

Again, wishful thinking got the better of me. I kept thinking market panic was still there. I re-placed the order at 140.2 and went back to work (I remember if I had bought directly then, the price shouldn't have exceeded 142). Looking back, it was a very immature performance. When the market offers an unprecedented, massive promotion, there's really no need to be greedy for a little extra.

It's also good. Only by missing out can you learn a lesson.

### The market cannot be predicted, only utilized. The mentality of seeking petty advantages must be avoided, or you deserve to miss out on the gains.

### Patience in waiting + decisiveness in action. Li Lu says this is one of the important qualities of a successful investor. It is indeed somewhat counter-intuitive; patience and decisiveness can sometimes be opposites, but upon careful thought, it's true.

$S&P 500(.SPX.US) 

$POP MART(09992.HK)

### Related Stocks

- [.SPX.US](https://longbridge.com/en/quote/.SPX.US.md)
- [09992.HK](https://longbridge.com/en/quote/09992.HK.md)
- [HPPD.SG](https://longbridge.com/en/quote/HPPD.SG.md)

## Comments (10)

- **非一般股民 · 2026-04-20T13:57:10.000Z**: You're being a Monday morning quarterback knowing 52% is an entry point. The reality is you watched it fall from 60 to 59, 58, 57, 56, 55, 54, 53. At each step back then, it could have been a fuzzy buy-in point. You wouldn't have known which of 5x or 4x was the bottom. By the time it rebounded from 
  - **长坡行者** (2026-04-20T14:14:18.000Z): I've calculated your method. To put it simply and roughly, adjust the position by 5% for every 5% change in the valuation percentile. For example, a 50% position at the 50th percentile, reduce to 45% 
- **夹竹桃567 · 2026-04-20T12:23:32.000Z**: Don't know how to predict the price, just placing market orders now~
  - **长坡行者** (2026-04-20T13:58:24.000Z): The current price has reached my buying point; buying directly at the market price is the most hassle-free move.
- **HydraZen · 2026-04-20T12:14:43.000Z**: Not buying. If it was carefully considered before, set at 90 then 90 it is. This is discipline.
  - **长坡行者** (2026-04-20T14:01:07.000Z): If you maintain strict discipline over the long term, the overall returns should be able to meet your expectations 👍. Not many people can achieve this.
  - **HydraZen** (2026-04-20T14:16:17.000Z): I've been playing for a few years, and only started to be disciplined last month. After strict execution, both accounts have seen new changes: fewer trades, yet steady growth in returns. I hope to sti
  - **长坡行者** (2026-04-20T14:23:02.000Z): Yes. Not being on the list is important.
- **盈亏同源～ · 2026-04-20T12:03:31.000Z**: If the price continues to fall later, you'll regret adding another dollar, knowing you could have just waited and gotten the deal done.
  - **长坡行者** (2026-04-20T14:02:52.000Z): If you regret adding one more dollar, it probably isn't value investing. If it drops to 85, you won't be able to sleep, right? 😅