Source: MetaTrader 4 Gold. Charts for financial instruments in this article are for illustrative purposes and does not constitute trading advice or a solicitation to buy or sell any financial instrument provided by Admiral Markets (CFDs, ETFs, Shares). Past performance is not necessarily an indication of future performance.
When using low spreads as a part of their trading strategy, it's important for traders to keep the following factors in mind:
ATR
Stop-loss vs stop grab
Correlation
Margin benefits
Spread percentage
ATRATR is the indicator that measures the volatility of a financial instrument. It also projects high and low range based on its calculation. The higher the ATR, the higher the volatility. For instance, if the AUD/NZD moved 60 pips a day while the EUR/USD moved 90-120 pips a day, the EUR/USD would have a higher ATR.
When it comes to low-spread trading, while higher volatility can compensate for a wide spread, the ideal scenario is one where the volatility is high while the spread is low. To go back to the previous example, if the AUD/NZD moved 60 pips a day, and you paid a 6-pip spread, the total trading profit would be based on 54 pips. By contrast, if the EUR/USD moved 100 pips and had a one pip spread, the profit would be calculated based on 99 pips.
Stop-loss vs. stop grab
Source: MetaTrader 4 GBP/USD. Charts for financial instruments in this article are for illustrative purposes and does not constitute trading advice or a solicitation to buy or sell any financial instrument provided by Admiral Markets (CFDs, ETFs, Shares). Past performance is not necessarily an indication of future performance.
You also need to consider what happens when your stop-loss gets hit on those high spread pairs. You are paying a huge spread when your 'market order' stop-loss order hits the market. That might create a pattern that collects all stops above or below it. The more stops that are hit, the stronger the move of the price is going to be. This might even push the price to the next support or resistance level, creating a fake out, caused by a stop grabber.
Correlation
Source: MetaTrader Supreme Edition - Correlation Matrix
In financial terms, correlation is the numerical measure of the relationship between two variables. The range of the correlation coefficient is between -1 and +1. A correlation of +1 denotes that the two currency pairs will flow in the same direction. A correlation of -1 indicates that the two currency pairs will move in the opposite directions, 100% of the time. Meanwhile, a correlation of zero denotes that the relationship between the currency pairs is completely arbitrary.
So in the chart above, you can see that EUR/GBP and GBP/USD are negatively correlated (-98). This means that they move in a completely opposite direction. If you compare the current ATR of EUR/GBP(70) to ATR of GBP/USD(128), it is very easy to see which pair to trade. Moreover, the spread on EUR/GBP is 2.5 pips, while GBP/USD has a spread of 1.4 pips.Occasionally you'll see that brokers change the spread and allow you to trade with extremely low costs, so make sure to look out for them!
Margin benefitsThe trader's account should be in a better position to handle setups with larger drawdowns before problems with margins hit the radar. Traders are, therefore, less limited in terms of the number of trades. This can be particularly useful when the market accelerates in its price action, and it suddenly offers the trader more opportunities to trade.
Spread percentageThe spread fluctuation might also depend on market factor, namely, liquidity. A market that is liquid means that it has many trades on a daily basis, and is composed of many active traders. The Forex market is extremely liquid because hundreds of banks and millions of individuals trade currencies on it every day. The spread is then divided by the average daily range of a currency pair. This gives us a percentage which tells us more precisely how much the spread costs. The lower the number, the better it is.
The spread can be considered an opportunity cost in the sense that it might reduce the amount of profit gained from the daily range calculated by ATR. The higher this opportunity cost, the more likely it is to convert to losing trades and, subsequently, real financial losses. In the table below are some examples using current average spreads* and ATR (the lower, the better).

Source: An example of a MetaTrader 4 account.
ConclusionIf we compare the first five instruments with the GBP/NZD currency pair at the bottom of the table further up, we can see a clear difference in the numbers, and therefore, it is easy to understand the effect of low spreads on opportunity costs, their benefits, and why they should be considered by professional traders.
The example in the screenshot above clearly shows that highly profitable gains are possible when using low spread scalping strategies. If you would like to attempt these strategies yourself, we would recommend that you use a Demo account first, in order to test them in a risk free environment, before transitioning to a live account and testing them in the real-life markets.
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(Wrote by Admiral Markets)