Why does an indifference curve slope downward?

Question

Accepted Answer

It shows that when a person gives up some of good  X  they must increase their consumption of good  Y  to remain indifferent.

Answer

It shows that when a consumer buys less of good  X , the consumer must buy more of good  Y  to spend all the income.

Answer

It shows that when a person gives up some of good  X  they can afford to increase their consumption of good  Y.

Answer

It shows that people are only happy when they increase consumption of all goods.

Answer

It shows that people increase consumption of goods when the price falls.

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