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by georgeecollins 1391 days ago
If the bank buys a share from someone else without any arrangement they are taking a risk. Their motive may be to support the price but people buy and sell shares with all sorts of motives.

If you buy a share from your self or from a party where you have an agreement to trade back at a fix price, no risk is taken. That's called a "wash trade" and is illegal for securities.