Market Makers Explained

Sources:
https://www.wsj.com/articles/citadel-securities-faces-new-pressure-over-gamestop-frenzy-11632863151

https://qz.com/1969196/citadel-securities-gets-almost-as-much-trading-volume-as-nasdaq/

https://www.investopedia.com/terms/m/marketmaker.asp

https://www.investopedia.com/terms/m/marketmakerspread.asp

https://www.investopedia.com/ask/answers/06/bidasknumbers.asp

https://www.thebalance.com/what-is-a-market-maker-and-how-do-they-make-money-4053753

https://www.nasdaq.com/articles/5-market-manipulation-tactics-and-how-avoid-them-2018-04-11

https://a16z.com/2021/02/17/payment-for-order-flow/

https://www.investopedia.com/terms/p/paymentoforderflow.asp