Unwritten Rules for Success on the Stock Market

• If the price drops 10%, just hold.
• If the price drops 20%, add 10%.
• If the price drops 30%, add 20%.
• If the price drops 40%, add 30%.
• If the price drops 50%, add 50%.
• If the price rises 10%, just hold.
• If the price rises 20%, still hold.
• If the price rises 30%, sell 10%.
• If the price rises 40%, sell 20%.
• If the price rises 50%, sell 30%.
• If the price rises 60%, sell 40%.
• If the price rises 100%, sell everything.

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This framework is a variation of tactical rebalancing, scaling, and value-averaging principles. At first glance, it reads like a disciplined antidote to emotional panic buying and selling. However, when evaluated from a practical, mathematical, and behavioral standpoint, it has both major strengths and hidden flaws.

Here is a breakdown of what works, what doesn’t, and what you should watch out for:

The Strengths: Why This Framework Has Merit

Enforces “Buy Low, Sell High”: The core philosophy forces you to take a contrarian approach. When markets crash (prices drop 30% to 50%), most people panic and sell; this plan forces you to accumulate assets at a discount. Conversely, when greed takes over in a massive bull run, it systematically trims your position.

Removes Emotional Decision-Making: Markets play psychological tricks on investors. Having a rigid, mathematical roadmap prevents you from freezing up during a crash or getting overly euphoric during a spike.

Encourages Capital Preservation: By steadily scaling out as a stock or portfolio climbs (selling 10% here, 20% there, and everything at +100%), you lock in profits and reduce your exposure to a potential market top or sharp correction.

The Flaws & Hidden Dangers: Why It Can Be Risky

The “Catching a Falling Knife” Liquidity Trap: * The Problem: The rules dictate that you add capital aggressively as the price drops (add 10%, 20%, 30%, 50%). If you are trading a single individual stock rather than a broad market index fund (like the S&P 500), a 50% drop is often not a temporary discount—it can be the beginning of a structural bankruptcy or long-term business decline (e.g., Enron, Kodak, or various cyclical tech stocks).

The Risk: You could rapidly exhaust all your cash reserves “buying the dip” on a company that never recovers.

Infinite Capital Requirements:

If an asset drops continuously, your required cash injections scale up dramatically. Unless you have an endless supply of sideline cash, you will run out of money before hitting the deeper tiers (-40% or -50%).

The Opportunity Cost of Selling Too Early (Bull Markets):

The Problem: Rules 8 through 12 require you to sell incrementally as a stock rises (+30%, +40%, +50%, all the way to +100%).

The Risk: In secular bull markets, generational companies (like Apple, Microsoft, or Nvidia historically) can easily run up hundreds or thousands of percentages over several years. Following this rulebook means you would completely exit your position long before the real wealth-generation phase finishes, missing out on massive compounding gains.

Tax and Transaction Friction:

Constantly buying and selling chunks of a portfolio triggers taxable events (Capital Gains Tax) and potential transaction fees, which can severely erode your net returns over time compared to a simple “buy and hold” strategy in tax-advantaged accounts.

The Verdict

If applied to individual stocks: Dangerous. Individual equities can go to zero, and scaling into a dying company based purely on percentage drops is a recipe for heavy losses.

If applied to a diversified broad-market index (e.g., a global or top-40 equity index): Reasonable, but rigid. Broad markets almost always recover over the long run, making “buying the dip” statistically sound. However, selling everything at a 100% gain means you might struggle with where to re-deploy that capital if the market keeps climbing.

Conclusion: It is a great mental framework for maintaining discipline, but it should be used with strict guardrails—specifically, never apply it to speculative individual assets, ensure you are working with a diversified portfolio, and be mindful of your cash flow limits so you don’t over-leverage yourself on a falling knife.