weakely consumption sets are convex. Draw typical indifference curves in a diagram, with xI on the vertical axis and x on the horizontal axis. Then answer 1. Is the preference monotonic? Is it of locally non-satiation? 2. When we derive a demand function for xi from this preference, is the demand curve continuous?weakely consumption sets are convex. Draw typical indifference curves in a diagram, with x1 on the vertical axis and x2 on the horizontal axis. Then answer: 1. Is the preference monotonic? Is it of locally non-satiation? 2. When we derive a demand function for x1 from this preference, is the demand curve continuous?