(Figure: Left Shoes and Right Shoes I) Nikolai enjoys eating sandwiches that have one slice of meat and two slices of cheese. His indifference curves are presented in Figure 4.12. Based on the shape of Nikolai's indifference curves, meat and cheese are: 
Definitions:
Hierarchical Systems
Organizational structures or systems characterized by levels of authority, where each level has control over the levels below it.
Cerebellum
A portion of the brain that plays an important role in motor control, and can also be involved in some cognitive functions such as attention and language.
Meninges
Protective membranes that cover the brain and spinal cord, consisting of three layers: the dura mater, arachnoid mater, and pia mater.
Cerebrospinal Fluid
A transparent, colorless liquid located in the brain and spinal cord, which offers padding while ensuring a constant environment.
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