Scalping Bid Ask Spreads
I do not know much of anything about trading so please bear with me here. I am wondering about scalping bid ask spreads and profiting off of them. This is not so I can trade on this, but I am just curious on the subject.
Can someone provide examples of how a trader can profit off of this? Say the spread is a bit wider on a smaller volume stock: Bid: 4.10 Ask: 4.20...How can a trader with say, $50,000 of funds exploit this and make money?
Thanks for any help.