Concept:Highly complementary goods are consumed together in fixed proportions, so their indifference curve is L-shaped and has a right-angled bend.Explanation:For such goods, extra units of one good without more of the other give no additional satisfaction.Thus, the indifference curve does not slope smoothly like a normal curve.Instead, it bends sharply at the point where the two goods are used in the required proportion.This sharp bend gives the curve an L-shape, not a curved or straight-line shape.