As we know from theory, the bid price (sell price) represents the maximum price that a buyer is willing to pay for security, for example, forex pair price. The ask price (buy price) represents the minimum price that a seller is willing to take for that same security. By default in MT4 and MT5 bid price (sell price) can be seen but ask price usually is not visible.
So, how to show bid and ask price on MT4?
Traders can show and bid and ask price on MT4 or MT5 chart when press right-click in the chart and select “Properties” (or press F8) and then in Common Tab check “Show ask line” option.
Bid and ask prices will appear on the MT4 platform chart. When you watch bid and ask difference (spread) you can see that it is not fixed. Spread is changing and when is volatility high, the spread can be much much bigger. Important news and volatility can increase the bid and ask difference, wider spread.