Erthang, Not a good idea to put in such a large order. It creates a "floor" and will most likely remain unfilled. Use smaller round numbers and all or none if you are bottom feeding. If you want to just support the price, you can leave it in as it forces anyone else that wants the stock to buy above you. If you leave it in and it does get filled, the truth is that you could have bought it lower.
I will be nice and make no more comments regarding how to trade.
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