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Large BUY LIMIT orders' effect on a stock's price
Traders sometimes look at the depth of the book (number of outstanding limit orders) to try and gauge the sentiment of the market or otherwise use this information to formulate their strategy.  If there was a large outstanding buy order at $49.50, there's a decent chance this could increase the price by influencing other traders. However, a limit order at $2 is like an amazon.com price of $200,000 for a book.  It's so far away from realistic that it is ignored.  People would think it is an error. Submitting this type of order is perfectly legal.  If the stock is extremely thinly traded, it might even be encouraged because if someone wanted to sell a bunch and did a really bad job of it, the price could conceivably fall that far and the limit order would be adding liquidity.  I guess.  Your example is pretty extreme. It is not uncommon for there to be limit orders on the book that are not very close to the trading price.  They just sit around.  The majority of trades are done by algorithmic traders and institutional traders and they don't tend to do this, but a retail investor may choose to submit an order like that, just hoping against hope. Also, buy orders are not likely to push prices down, no matter what their price is.  A sell order, yes (even if it isn't executed).