Figure 21-31 The figure shows two indifference curves and two budget constraints for a consumer named Kevin. 
-Refer to Figure 21-31. Suppose Kevin is optimally purchasing 12 shirts and 28 sweaters, and he is spending $648 on shirts. What is the price of a sweater?
Definitions:
Serotonin Levels
The concentration of serotonin, a neurotransmitter, in the body, which can affect mood, appetite, and sleep.
Protein-rich Meal
A meal that contains a high proportion of proteins, which are essential nutrients for the body's repair, growth, and maintenance.
Progesterone
A hormone released by the ovaries that prepares the uterus for pregnancy and maintains it until birth.
Uterine Lining
The layer of cells that lines the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.
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