How do market makers make markets and can it be applied to this game?

Do market makers basically just buy anything that people want to sell and sell anything that people want to buy? Does price bought/sold at matter to market makers? What do market makers do and how do they do it?

I don’t own the game and I am not a part of the game’s development team. Just asking because the in-game markets are lacking liquidity in the form of Robux right now and I’m trying to see if/how this can be solved.

I’m holding 200K Robux worth of Grow A Garden stock and need to find a way to sell it all in a reasonable amount of time.