what is the relationship between indifference curve and mrs 
essentially mrs is the slope of the indifference curve at any single point along the curve most indifference curves are usually convex because as you consume more of one good you will consume less of the other so mrs will decrease as one moves down the indifference curve this is known as the law of diminishing marginal rate of substitution if the mrs is increasing the indifference curve will be concave which means that a consumer would consume more of x for the increased consumption of y and vice versa but this is not common 