Both of these two functions relate to mall store management. They should be fairly self-explanatory (refresh_shop() refreshes Mafia's view of your mall store, shop_price(item) is the price of the item in your mall store; I think it defaults to 0 for an item not in stock, but that didn't really bother me).
I found it odd that refresh_stash() existed, but not refresh_shop().
I found it odd that refresh_stash() existed, but not refresh_shop().