Fifty Percent Principle: What it is, How it Works, Example (2024)

What Is the Fifty Percent Principle?

The fifty percent principle is a rule of thumb that anticipates the size of a technical correction. The fifty percent principle states that when a stock or other asset begins to fall after a period of rapid gains, it will lose at least 50% of its most recent gains before the price begins advancing again.

Key Takeaways

  • The fifty percent principle is used to predict how much value a stock will lose during a correction.
  • It states that if an asset drops after a price increase, it will lose between 50% and 67% of recent price gains before rebounding.
  • Technical analysts use the fifty percent principle to identify a good entry point into a particular stock and ensure that there support levels to prevent further drops.
  • The principle works because most investors share the same behaviors when faced with a price drop.
  • The fifty percent principle works best for short-term trading and may be less effective in the case of major economic events.

Understanding the Fifty Percent Principle

The fifty percent principle predicts that when a stock or other security undergoes a price correction, the price will lose between 50% and 67% of its recent price gains before rebounding. As a tool of technical analysis, traders use the principle to predict the ideal entry point in order to maximize profits when the upward trend resumes.

The fifty percent principle is one of several technical theories that attempt to identify support levels in market behavior. Understanding this principle guides other charting techniques, such as pattern analysis and Fibonacci ratios, when following a stock price bouncing between its support level and new highs.

This form of chart analysis is most often used in short-term investing. This is because it’s risky to rely on charting for longer periods due to the unexpected impacts of major economic events. Large events, such as the financial crisis of 2008, reconfigurethe total economy and markets.

An investor who adheres to the fifty percent principle and starts buying after the expected correction occurs may lose money if the price continues downward due to larger events such as a shift from a bull market to a bear market.

Like other forms of chart analysis, the fifty percent principle is generally used for short-term investing. It is less effective for longer periods, due to the potential impacts of major, market-changing events.

See Also
80% Rule

Fifty Percent Principle Example

As an illustration of the fifty percent principle, imagine a hypothetical Company ABC whose price rises from $100 to $150, before falling back to $140.The trend line looks fairly consistent in its upward trajectory, and an incautious investor would be tempted to buy ABC for $140.

However, according to the fifty percent principle, ABC still has room to fall before any likelihood of a rebound. Since the price of ABC rose by $50 before the correction started, the fifty percent principle states that it will fall by $25 to $33 from the peak, before potentially rising again. A trader who follows the principle would therefore set buy orders at a price somewhere between $125 and $117.

Special Considerations

Much of investor behavior is driven by market psychology. The more investors believe in the fifty percent principle, the more it will continue to drive price momentum. This becomes a self-fulfilling prophecy, since most investors try to profit by following the market.

A fascinating exception to herd mentality psychology can be seen among contrarian investors, who intentionally stray from the herd to bet against the wisdom of the crowd. In some cases, particularly during periods of irrational exuberance, it may be more profitable to resist the herd instinct.

What Is the OFAC Fifty Percent Rule?

The fifty percent rule is used to identify entities that are sanctioned by the Office of Foreign Assets Control. It states that if blocked persons collectively own more than 50% of a company, trust or other entity, that entity is itself blocked by OFAC and cannot receive transactions from any U.S. entity. Although there are some suggestions, this rule effectively prevents sanctioned individuals from using the global banking system.

What Is the 50/20/30 Rule?

The 50/20/30 rule is a rule of thumb used in household budgeting. Originally popularized by Elizabeth Warren, it says that 50% of a family's after-tax income should be spent on "needs," such as groceries, insurance, bills, and rent or mortgage payments. Of the remainder, 20% should be spent on savings, while the remaining 30% can be used for unnecessary "wants."

What Is the Fifty Percent Rule in Real Estate?

In real estate, the fifty percent rule states that the operational costs of a rental property will amount to about 50% of its gross income. For every $1 of rental income, landlords should expect to spend half on repairs, maintenance, property taxes, and insurance. This rule is based on the observational experience of many real estate investors, but individual properties may have higher or lower costs depending on local markets.

Fifty Percent Principle: What it is, How it Works, Example (2024)


Fifty Percent Principle: What it is, How it Works, Example? ›

Fifty-Percent Principle

What is the fifty percent principle example? ›

Fifty Percent Principle Example

As an illustration of the fifty percent principle, imagine a hypothetical Company ABC whose price rises from $100 to $150, before falling back to $140. The trend line looks fairly consistent in its upward trajectory, and an incautious investor would be tempted to buy ABC for $140.

How does percentage on stocks work? ›

Take the selling price and subtract the initial purchase price. The result is the gain or loss. Take the gain or loss from the investment and divide it by the original amount or purchase price of the investment. Finally, multiply the result by 100 to arrive at the percentage change in the investment.

How do you calculate a ratio how the market works? ›

The price-to-sales ratio (Price/Sales or P/S) provides a simple approach: take the company's market capitalization (the number of shares multiplied by the share price) and divide it by the company's total sales over the past 12 months. The lower the ratio, the more attractive the investment.

What is the 50 day rule? ›

The 50-day moving average is a straightforward strategy. If prices graze the average as support and then bounce back, a trader can buy a stock. If prices rise at this average as resistance and pull back, a trader must consider selling or shorting the stock before a further decline.

What is an example of a percent used in real life? ›

For example, discounts in shops, bank interest rates, rates of inflation and many statistics in the media are expressed as percentages. Percentages are important for understanding the financial aspects of everyday life. Much of what we buy in the shops has a 10% Goods and Services Tax (GST) included in the price.

What is an example of how you use percent problems in your daily life? ›

Let's say a shirt costs eight dollars, but it's on sale for 50% off. This means it will cost fifty percent less than the original price, or half as much. This discount is a percentage of the original price. Here, 50% off means the discount is 50% of $8.

How much money do I need to invest to make $1000 a month? ›

A stock portfolio focused on dividends can generate $1,000 per month or more in perpetual passive income, Mircea Iosif wrote on Medium. “For example, at a 4% dividend yield, you would need a portfolio worth $300,000.

How much money do I need to invest to make $3,000 a month? ›

Imagine you wish to amass $3000 monthly from your investments, amounting to $36,000 annually. If you park your funds in a savings account offering a 2% annual interest rate, you'd need to inject roughly $1.8 million into the account.

At what percentage should I sell my stock? ›

Here's a specific rule to help boost your prospects for long-term stock investing success: Once your stock has broken out, take most of your profits when they reach 20% to 25%. If market conditions are choppy and decent gains are hard to come by, then you could exit the entire position.

What ratio is most important to an investor? ›

The price-to-earnings (P/E) ratio is quite possibly the most heavily used stock ratio. The P/E ratio—also called the "multiple"—tells you how much investors are willing to pay for a stock relative to its per-share earnings.

What is a good earnings per share? ›

There is no hard and fast number to define a good EPS across companies. Since so many factors go into a company's net income and stock price, variables always exist from one company to the next. To determine whether a company's EPS is "good," it's essential to consider the company's earnings per share in context.

What is an example of a ratio calculation? ›

If you are comparing one data point (A) to another data point (B), your formula would be A/B. This means you are dividing information A by information B. For example, if A is five and B is 10, your ratio will be 5/10. Solve the equation. Divide data A by data B to find your ratio.

What is the 50 simple moving average? ›

A 50-day moving average is equal to the average price that all investors paid for the asset over the past 10 trading weeks (or two and a half months), making it a commonly used support level.

How does the rule of 75 work? ›

Rule of 75

This rule states that you must be a minimum of 55 years of age and have a minimum of 10 years of full-time service without any intervening breaks in service*; if you meet both minimums, then the total of your age and years of service must equal at least 75. Age and years of service must be in whole years.

What is the 50 exponential moving average? ›

The most common formula takes the last 50 price bars and divides by the total. This yields the 50-day simple moving average (SMA) used by technicians for many decades. The calculation has been tweaked in many ways over the years as market players try to build a better mousetrap.

What is the rule of 50 percent? ›

The rule stipulates that if a blocked person or entity owns a 50 percent or greater interest in another entity, that second entity is also considered blocked, regardless of whether it is explicitly listed on OFAC's Specially Designated Nationals and Blocked Persons List (SDN).

What is the percentage principle? ›

In mathematics, a percentage is a number or ratio that can be expressed as a fraction of 100. If we have to calculate percent of a number, divide the number by the whole and multiply by 100. Hence, the percentage means, a part per hundred. The word per cent means per 100.

What is 50 percent equity? ›

Fifty-Percent Equity Interest means, in respect of any corporation (within the meaning of the Code), stock or other equity interests of such corporation possessing (i) at least fifty percent (50%) of the total combined voting power of all classes of stock or equity interests entitled to vote, or (ii) at least fifty ...

What is a 50 50 cash stock? ›

50-50 cash stock purchase is used in equity. After the valuation of the company, the Investors were asked to invest into the company by paying half of the investment money in cash to the shareholder.


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