(Figure: Good Y and Good X V) In panel (a) , the price of good X is $1.50 per unit and the price of good Y is $3 per unit. In panel (b) , the consumer's income increased from $400 to $480.
Panel (a) Panel (b) 
Using panel (b) , the income elasticity of demand for good X is _____.
Definitions:
Banality of Evil
A concept introduced by Hannah Arendt, suggesting that ordinary people can commit atrocious acts simply by following orders and conforming to what is considered normal behavior in their society.
Hannah Arendt
A political theorist known for her work on the nature of power, authority, and totalitarianism, as well as her analysis of the banality of evil.
Adolf Eichmann
A high-ranking Nazi official who played a major role in the logistics of the Holocaust, responsible for facilitating and managing the mass deportation of Jews to ghettos and extermination camps.
Fundamental Attribution Error
The tendency to overemphasize personality traits and underestimate situational factors when explaining someone else's behavior.
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