Morris, age 4, is having lunch with his mother and sister. H…
Morris, age 4, is having lunch with his mother and sister. His mother pours milk into the shorter, fatter glass in front of Morris and an equal amount into a slender, taller glass in front of Morris’s sister. Morris complains that his sister got more milk than he did, and even when his mother tries to explain that they both got the same amount, Morris insists he is right. In this example, Morris is demonstrating a lack of development in the area of __________.