The price of lemonade is $0.50; the price of popcorn is $1.00. If Fred has maximized his utility by purchasing lemonade and popcorn, his marginal rate of substitution will be:
A) 2 lemonades for each popcorn.
B) 1 lemonades for each popcorn.
C) 1/2 lemonade for each popcorn.
D) indeterminate unless more information on Fred's marginal utilities is provided.
A
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