Suppose the utility function of an individual is given by: U(x, y) = xy^2. The marginal rate of substitution between y and x is decreasing in x. The marginal rate of substitution between y and x is increasing in x. The marginal rate of substitution between y and x is MRS_{x, y} = 2y/x. This utility function implies that good y is preferred to good x so the bundle (2, 1) is preferred to (9, 0.5).