I keep hearing about the 50-day, 100-day and 200-day moving averages. What do they mean, how do they differ from each other, and what causes them to act as support or resistance?

By Casey Murphy AAA
A:

Whether you are using the 50-day, 100-day or 200-day moving average, the method of calculation and the manner in which the moving average is interpreted remain the same. A moving average is simply an arithmetic mean of a certain number of data points. The only difference between a 50-day moving average and a 200-day moving average is the number of time periods used in the calculation. The 50-day moving average is calculated by summing up the past 50 data points and then dividing the result by 50, while the 200-day moving average is calculated by summing the past 200 days and dividing the result by 200. (To learn more, see our Moving Averages tutorial.)

As the question implies, many technical traders use these averages as an aid in choosing where to enter or exit a certain position, which then causes these levels to act as strong support or resistance. Simple moving averages (SMA) are often viewed as a low-risk area to place transactions, since they correspond to the average price that all traders have paid over a given time frame. For example, a 50-day moving average is equal to the average price that all investors have paid to obtain the asset over the past 10 trading weeks (that is, over the past two and a half months), making it a commonly used support level. Similarly, the 200-day moving average represents the average price over the past 40 weeks, which is used to suggest a relatively cheap price compared to the price range over most of the past year. Once the price falls below this average, it may act as resistance because individuals who have already taken a position may consider closing the position to ensure that they do not suffer a large loss.

Critics of technical analysis say that moving averages act as support and resistance because so many traders use these indicators to inform their trading decisions. For more on this debate, see Can technical analysis be called a self-fulfilling prophecy?

RELATED FAQS

  1. How is accumulation area calculated?

    Explore the use of accumulation areas in the analysis of traded securities. Learn about on-balance volume and its role in ...
  2. How is the Accumulative Swing Index calculated?

    Learn how the accumulative swing index is calculated using swing index. Explore absolute value and how it is used in the ...
  3. What are the differences between a bar chart and candle sticks?

    Explore the difference between bar and candlestick charts. Learn how technical analysts use charts in the analysis of supply ...
  4. What is the difference between enterprise value and equity value?

    Valuating a business accurately depends heavily on the purpose of the valuation. Learn how enterprise value and equity value ...
RELATED TERMS
  1. Appraised Equity Capital

    The excess of the market value of an asset over its book value. ...
  2. Asset Valuation Review (AVR)

    A process that establishes an estimate of the value of a failed ...
  3. Derived Investment Value (DIV)

    A valuation methodology used to calculate the present value of ...
  4. Forex Spread Betting

    A category of spread betting that involves taking a bet on the ...
  5. Mass Index

    A form of technical analysis that looks at the range between ...
  6. Money Flow Index - MFI

    A momentum indicator that uses a stock’s price and volume to ...
Related Articles
  1. How Trading Algorithms Are Created
    Trading Strategies

    How Trading Algorithms Are Created

  2. Quants: What They Do and How They've ...
    Trading Strategies

    Quants: What They Do and How They've ...

  3. An Introduction To Price Action Trading ...
    Trading Strategies

    An Introduction To Price Action Trading ...

  4. Getting Market Leverage: CFD versus ...
    Investing Basics

    Getting Market Leverage: CFD versus ...

  5. Contract for Difference (CFD) Risks
    Trading Strategies

    Contract for Difference (CFD) Risks

Trading Center