Write Your Sell Rule Before Buying

Capital Propulsion breaks down practical investing decisions in plain English. This companion article expands on the video so you can review the key ideas, compare the tradeoffs, and come back to the framework later.

Watch the full video on YouTube.

Key takeaways

• Write Your Sell Rule Before Buying
• The costliest beginner mistake is not a bad choice; it is selling a good one early.
• If you cannot state that condition, you have no exit rule, only a mood.

The core idea

The costliest beginner mistake is not a bad choice; it is selling a good one early. A first investment gets bought with attention and sold with emotion, usually during the first sharp fall, which is the only moment the loss becomes permanent. Before you buy anything, write down the condition that would make you sell it.

If you cannot state that condition, you have no exit rule, only a mood. The market does not punish the wrong pick nearly as reliably as it punishes the unplanned exit.

Bottom line

The goal is not to chase every headline. It is to build a repeatable decision process: understand the risk, compare the opportunity cost, and make choices that fit your time horizon.

Quick investor checklist

• What problem is this investment decision supposed to solve?
• What are the fees, taxes, and concentration risks?
• Would the decision still make sense if markets moved against you for a year?
• How does it fit with your existing portfolio and time horizon?

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