When the marginal rate of substitution is large: consumers are willing to give up an unlimited quantity of the good on the horizontal axis for one more unit of the good on the vertical axis. consumers are willing to give up an unlimited quantity of the good on the vertical axis for one more unit of the good on the horizontal axis. consumers are willing to give up a large quantity of the good on the vertical axis for one more unit of the good on the horizontal axis. consumers are willing to give up a large quantity of the good on the horizontal axis for one more unit of the good on the vertical axis