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system
large orders and market manipulation
user
if you own a stake large enough to do that, you became regulated - under section 13(d) of the 1934 act and regulation (in case of us stock) and you became regulated. restricting you from "shocking" market. another thing is that your broker will probably not allow you to execute order like that - directed mkt order for such volume. and market is deeper than anyone could measure - darkpools and hfts passively waiting for opportunities like that.
assistant