The table shows the marginal utility that a consumer obtains from consuming successive units of good X.
The price of good X is $4.
What additional information is needed to determine the quantity of X that the consumer will purchase?

1 )
the consumer’s income elasticity of demand for good X
2 )
the consumer’s price elasticity of demand for good X
the marginal utility of money to the consumer
4 )
the marginal utility that the consumer obtains from substitute goods
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