Got today this game called "Recettear: An item shop's tale"
It's a story about this one loli who's trying to pay to a fairy a dept what her father left. She will open a shop and you have to manage, sell and buy all kinds of stuff to get money to pay the debt back.
To get all this stuff what you sell you can buy from Merchants's Guild, Marketplace and sell it for much higher then you bought or you can send people to dungeons and get items there.
This explains the game pretty much like it is: