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Can someone explain to a beginner why DUST calls fell in price today even though the ticker moved significantly upward? Would a much higher volatility, and accompanying price in call prices on on Fri, followed by a drop in Volatility today be the explanation? How can one determine if an option...

Should someone with a $1-25mm account value who still wants to day trade continue as a retail investor at a brokerage firm such as etrade, schwab, IB etc? How about someone with a much larger account, $100-500mm? Would someone at that larger account value still use a retail brokerage and trade...

It was a limit order for the quantity of shares that the ask was showing. Is there some market maker strategy that would explain a disappearing ask just before my ask shows up on the bid/ ask table? It appears to be coordinated, and not an isolated erroneous instance, for the ask price to...

is it possible to investigate past shifting/ disappearing ask orders even when no trade occurred?

ETF options or equity options Trading directly through brokerage site- TDA I should clarify that, when I enter the buy order for $0.10, the listed ask of $0.10 will disappear and be replaced by another higher priced ask, $0.20. And if I were to submit a buy order for the $0.20 deep deep out of...

Options pricing tables will routinely show deep, deep out of the money options priced at $0.05 or $0.10 ask, yet when orders are submitted at those prices, the listed $0.05 or $0.10 ask prices disappear and the order goes unfilled. Orders for those same deep out of the money options typically...