We had a "Shopping Mall" on PC era... It was riddled with bugs and was eventually closed forever... How it worked....
You paid X ammount of money to open up a stall and you could place up to 5 items on the table with a price... anyone could walk up to your stall and buy your items....
How ever.... Most people would put prices of there items t 9999999 and hog the stall all day and afk with the slogan "AFK PM me offers"...