Honestly, it took me a lot of time to understand how to buy the dip. My first positions were catastrophic, and I lost a lot of money before I knew when to buy the dip. Thanks to my mistakes, I established ten rules for buying a dip safely from a long-term investment. Let me share my experience and explain the ten rules.

buy the dip rules

How did I lose 10 000$ in five minutes?

I took my first counter-trend entry on the oil companies during the crumbing of 2015. I increased my positions while falling until I reached considerable exposure. In 2016, the OPEP strongly reduced its crude oil production, triggering a significant rise for oil companies. On this day, I hit the jackpot! I thought I had discovered the secret to making money in stocks. During the second crude oil drop, I restarted averaging an enormous position on oil companies, including “Gulfmark Offshore”. The OPEP reduced its crude oil production again, but the market considered this measure insufficient. The crude oil dropped 7% in the day, and Gulfmark filed for chapter 11 sometime later. I fired sale my position and took a loss of 10000$. I repeated the same error with the automotive industry sometime later, ending with another significant loss.

Gulfmark Offshore chapter 11
Gulfmark Offshore stock price

After that, I questioned my investment capacity and decided to learn trading system programming and backtesting. I started a long period of strategy backtesting using the Prorealtime platform. I might have experimented with thousands of strategies on many assets. I will share the rules I found to buy a dip on the market safely.

1. Selecting a stock list

When the market falls, many opportunities occur. If you do not have a list of stocks or ETFs, you will be flooded with a number of opportunities. You will risk opening positions without deeply analyzing what you will regret later. In a market-falling case, you should prepare a list of stocks and ETFs you agreed to buy. Ideally, this list would contain, at most, ten stocks and ETFs.

Here is my stocks list I would buy during a dip:

Procter & Gamble
Colgate Palmolive
Air Liquide

Here is my ETFs list I would buy during a dip:

iShares Dow Jones Industrial Average
iShares MSCI World Consumer Staples
iShares STOXX Europe 600 Personal & Household Goods

In the post “What ETFs to buy during a bear market?” I explain why I chose these ETFs.

2. Prioritizing the quality of fundamentals

There is something counter-intuitive during a bear market. The most solid company stocks decrease smaller than the others. One is tempted to buy a stock that dropped 50% rather than another that dropped 20%. In fact, it is the opposite. The stocks that decreased less during a crash or a recession have the most chance to benefit better from the next bull market. The companies with the most robust fundamentals will likely bounce back and profit from the next economic cycle.

You can see how Procter & Gamble survived the pandemic crisis:

Procter & Gamble, net income vs operating income
Procter & Gamble, net income vs operating income

See the Procter & Gamble financial statements

3. Choosing the best sectors

Choosing the right sector is essential if you want to buy the dip. Some sectors are definitively unsuitable for counter-trend strategies. This is especially true in the energy, automotive, and raw materials sectors. These sectors are too volatile to identify a dip. Others, like the technology and utility sectors, are very sensitive to interest rates. While the interest rates are low, buying the dip in the technologies and utilities gives benefits. If the rates increase, they risk plunging for a long time.

The sector I prefer to buy the dip is Consumer Defensive. The included industries in this sector produce critical goods in daily life.

household and food industries
Household & food industries

4. Favoring the low beta

You should pay attention to the beta during a highly volatile market period. The beta indicates the volatility of an asset regarding a benchmark index. Habitually, the benchmark is the S&P 500. A 0.5 beta of a stock means the amplitude of its price is two times lower than the S&P 500. If the S&P 500 decreases by 20%, this stock decreases by 10%. Inversely, if the S&P 500 increases by 20%, this stock increases by 10%. If a stock’s beta is 2, its volatility is twice higher than the S&P500.

The following chart shows the performance of the low-volatile stocks against the US stock market:

Low Volatility Strategy in the US Stock Market
Low Volatility Strategy in the US Stock Market


5. Defining the maximum position size

It is crucial to define the maximum position size. That will allow you to avoid a portfolio that is too imbalanced. I think my worst mistake has been to take an enormous position in one alone stock. If you are wrong on one stock in a rightly balanced portfolio, this mistake will be compensated by the other lines. The position size depends on the type of asset you operate. I defined a maximum position size of 2000€ per stock, 5000€ per specialized ETF, and 10000€ per main ETF. A “specialized ETF” is a sectorial ETF like the Consumer Staples index, and a “main ETF” reproduces a major index like the S&P 500.

Here is the summary table showing the relative position size to your capital:

Type  of AssetCapital proportion
Specialized ETF5%
Main ETF10%

6. Define the entry size

After defining the maximum position size, you will have to set the size of each entry you will open on an asset. Habitually, I open entries between 500€ and 1000€. The definition of the ideal entry size depends on several factors. The entry size will mainly depend on the maximum position size and the broker fees. I chose a low position size, for example, 2000€, I will take stakes of 500€. If the total position size is 10000€, I will open stakes of 1000€. However, if the broker fees are high, I would prefer to open entries for 1000€ to reduce the transaction cost. In principle, if you trade liquid stocks or main indexes, the spread would be thin.

Summary entry size table:

Max Position SizeLow Broker FeesHigh Broker Fees

7. Choosing the right time unit

The time unit corresponds to the candle duration. The most adapted time units for long-term investments are weekly and monthly. These time units allow for highlighting the trend of an asset. You can set an entry point from a daily timeframe for long-term investment. But, if you go under a daily time unit, you will risk confusing the market noise with the buying signal. The more you watch the market in a short time, the more the market movements are noised. The good way consists of identifying the trend from a monthly timeframe and setting the entry points from a daily or weekly timeframe.

These two following charts show a noised price timeframe (5-minutes) and a timeframe allowing the trend reading (monthly):

Five-minute Dow Jones price:

Five-minute Dow Jones price

Monthly Dow Jones price:

Monthly Dow Jones price:

8. Defining a buying frequency

The space-time between each new entry characterizes the buying frequency. When I buy a dip, I prefer to space my entries and take time to build a position. Usually, I space each entry by one month. It is impossible to predict the deep and its duration. In addition, if you respect a monthly buying frequency by imposing you to buy one alone entry, that will force you to select the best opportunity. That meets the second rule, which is favoring quality.

Example of an investment signal system buying a dip on the Euro Stocks 50:

investment signal system buying a dip
Investment signal system buying a dip

I wrote a complete post explaining how to buy the dip. You can get the source code of the buy-the-dip signal system that is runnable on the Prorealtime platform.

9. Spotting the main long-term supports

The main supports are significant price levels. They correspond to prices on which big price movements occur. For example, they could be the historical high or low. These price levels durably shifted the market trend.

These supports and resistances can be « predicted » thanks to monthly Fibonacci retracements. Most trading platforms allow the monthly pivots to be printed on the chart price. These pivots will indicate if the market will rebound or confirm its trend. If the market bounces on a monthly pivot or an older highest/lowest price, that may be the end of the dip. If the price crosses these levels, the market could continue its trend.

Here are some monthly pivot points on the Euro stocks 50:

monthly pivots Euro stocks 50
Monthly pivots Euro stocks 50

10. Be patient

I think patience is the best quality for an investor. However, be careful on this point: patience does not mean buying the highest price; seeing the market collapsing, and concluding that you must be patient to get your money back. The patience counts as before opening an entry as after. From a monthly point of view, the dips occur approximately every two years on the main indexes. You must show patience before starting a position construction in a dip. The market needs time before a bounce. It can consolidate during several quarters. You must show patience again before the market gives you right.

be patient in investment
Be patient


Buying a dip amounts to betting against the market. That means you consider everybody wrong. From a long-term perspective, it can be justified. If you believe the root cause of the market fall is episodic and the world economy will absorb it, you may be right to buy the market. However, do not forget the technological bubble bursting in 2001 and the real estate 2008 crisis. You should not buy the dip if you think there is a bubble bursting or a paradigm shift.

In the next post, I will describe how I buy the dip and show you the technical indicators and algorithms I use to build a position during a dip.

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