How many positions you have open when trading can affect your performance. It is possible that too many open positions can lead to stressful situations where you end up taking big losses, or maybe some of the positions were correlated to each other, and effectively you are over exposed in the markets.
There are 2 common trends when we review the number of open positions traders have.
The first one is a weakness when only one product is traded.
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Having a single position open can be a negative if you've just opened a trade because you're bored. When you open a couple more, you get in the zone and become more focused, and so improve your performance.
Alternatively, having too many open positions could negatively impact your performance if you don't spend adequate time assessing each one of your trades, and start to make impulsive mistakes.