Proximus:
Its Bid. I believe its done to reduce the size of the data. If both bid and ask was stored, the data would be double the size. So, why not Ask, well they had to choose one-or-the-other. Anyways, the why questions are better directed to metaQuotes.
What is close[0], since it represents the current tick,it must be the current quoted price, so:
Is it the current Bid or the Ask price, and how does the MT4 choose which one? Or is it the average of them?
For example currently on my broker Bid=Close[0], but why not the Ask ? Please explain, thanks!
Mt4 charts are bid charts. The High, low open and close are all bid prices.

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What is close[0], since it represents the current tick,it must be the current quoted price, so:
Is it the current Bid or the Ask price, and how does the MT4 choose which one? Or is it the average of them?
For example currently on my broker Bid=Close[0], but why not the Ask ? Please explain, thanks!