---
type: "Topics"
locale: "en"
url: "https://longbridge.com/en/topics/40286105.md"
description: "Just stick to the formula for calculations—buy when it's low, sell when it's high. Even value investing requires selling; you calculate where its fair value midpoint is, and if it goes above that, you still have to sell."
datetime: "2026-04-29T13:24:09.000Z"
locales:
  - [en](https://longbridge.com/en/topics/40286105.md)
  - [zh-CN](https://longbridge.com/zh-CN/topics/40286105.md)
  - [zh-HK](https://longbridge.com/zh-HK/topics/40286105.md)
author: "[奇迹的交易员cola](https://longbridge.com/en/profiles/10743314.md)"
---

# Just stick to the formula for calculations—buy whe…


### Related Stocks

- [SCCO.US](https://longbridge.com/en/quote/SCCO.US.md)

## Comments (13)

- **鲍威er的交易员 · 2026-04-30T12:30:05.000Z**: It's strange that when US copper was at 600, the price of Southern copper stock was already above 200. Now US copper is at 600, but the stock price is still at 170. Is the elasticity so lagging?
  - **奇迹的交易员cola** (2026-04-30T13:03:25.000Z): Once it bounces up, it's no longer lagging, and of course, there's no buying opportunity either.
  - **新用戶_dVTLAA** (2026-04-30T15:08:13.000Z): If Xiao Gu doesn't sell, no matter how you try to push it up, it won't go up🤣
- **西瓜呀 · 2026-04-30T00:35:04.000Z**: Continuous analysis, continuous sharing 😊🌸
- **每天吃大肉 · 2026-04-29T14:13:00.000Z · 👍 1**: Now at 1.104, still want to buy in at 160. Rising oil prices are affecting copper, not as clear as CLF.
  - **赚美金买sf90！** (2026-04-29T14:22:11.000Z): Then you might as well just keep an eye on clf
  - **幸运币** (2026-04-29T14:56:58.000Z): 🌚How did you know I was staring right at it
  - **赚美金买sf90！** (2026-04-29T14:58:38.000Z): Because me too, hahaha
- **在下悠悠 · 2026-04-29T13:54:09.000Z**: What is considered high and what is considered low?
  - **价值投资奔幸福** (2026-04-30T00:38:41.000Z): It was in Cola's previous post, just scroll back a bit.
- **chase · 2026-04-29T13:44:21.000Z**: Can you teach me how to calculate it?
- **Lordly · 2026-04-29T13:42:47.000Z**: I really don't understand, will research it tonight.
- **过山河 · 2026-04-29T13:30:45.000Z**: 1.1