You can see the difficulty. Where do you draw the control volume? Is “Student Account”, “credit card”, “student store” considered off-book, as some posters here imply; and only “mad money” being considered? Or are you all on your own for ALL expenses including the student store, airport transportation, train tickets, etc.? What must you purchase from your monthly allowance? Hopefully you get a feel from these posts that there is not a huge need for extra money.