The following figure depicts possible indifference curves of Alan, whose utility depends on his and/or his friend Beatrice’s levels of consumption. Alan’s consumption is along the horizontal axis while Beatrice’s consumption is along the vertical axis. Read the following statements about the curves (a) to (d) and select the correct one(s). 多项选择题

A

Indifference curve (a): Alan only cares about Beatrice's consumption level.

B

Indifference curve (b): Alan only cares about the sum of his and Beatrice's consumption.

C

Indifference curve (c): Alan only cares about his consumption level.

D

Indifference curve (d): Alan's utility is derived from the minimum of his and Beatrice's consumption levels.

E

(a) represents altruistic preferences.

F

(b) represents altruistic preferences.

G

(c) represents altruistic preferences.

H

(d) represents altruistic preferences.

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