If you’ve used the MetaTrader client terminal to trade foreign exchange currency pairs via a provider such as RPD FX, you will have noticed how the charts that are embedded in order tickets show two price lines rather than one. The lower line shows the bid (selling) price and the upper line shows the ask (buying) price.
I like this idea, and coincidentally I used the same idea in my Better Spread Betting book to illustrate how spread bettors buy on the upper (ask) price line and sell on the lower (bid) price line… with the distance between the two lines indicating the bid-ask spread.
I was thinking about why all price charts are not shown this way, and then it dawned on me that most traders use candlestick charts rather than line charts. Just imagine how messy it would look with both “bid” and “ask” candles superimposed. Yuck!
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Disclaimer: this posting is for general education only; it is not trading advice.