A while ago there was a "flash crash" in the price of Ethereum widely understood to be the result of a particularly large sell order.
I have recently heard people saying that the person who placed the order did so intentionally to manipulate the market.
My understanding is that market manipulation is illegal on the stock market.
This leads me to my question (which is very hypothetical; this will never happen). If I placed a large enough market buy order (on the scale of an extremely liquid large cap stock's market cap) so that there is no way for supply to keep up with demand, would I be breaking any laws or regulations? If I can't make a market order on that scale can I make a limit order with an absurd limit? Is there any way for a normal participant of the market to break regulation by just making orders?
It would seem to me that this doesn't really fit the definition of "market manipulation" since I am a (horribly irrational) participant in the market.