Suppose consumers use k units of good X and w units of good Y in fixed proportion. Then, Question 10 options: X and Y are goods and indifference curve is bowed inward towards origin X and Y are perfect substitutes and indifference curve is bowed inward towards origin. X and Y are goods and indifference curves are lines since marginal rate of substitution is constant. X and Y are perfect complements and indifference curves are L shaped