Juan has preferences that satisfy more is better on bundles of two goods (x, y). In some market situation Juan spends 2/3 of his income in good x. When the price of good x drops by 50%, all the other constant, Juan spends more than 2/3 of his income in good y. We can infer that good x is a Giffen good for Juan.
No.

Yes.

In a sumif conditional function, what should be the order of terms in the parentheses?

Oliver's company is planning the launch of their hybrid cars. the company has included "never-before-seen" product benefits in the hybrid cars. which type of advertising should oliver's company use for the new cars?

David consumes two things: gasoline (g) and bread (b). david's utility function is u(g, b) = 10g^0.25 b^0.75. use the lagrange technique to solve for david's optimal choices of gasoline and bread as a function of the price of gasoline, p_g, the price of bread, p_b, and his income m. with recent decrease in the price of gasoline (maybe due to external shock such as shale gas production) does david increase his consumption of gasoline? for david, how does partial differential g/partial differential p_g depend on his income m? that is, how does david's change in gasoline consumption due to an increase in the price of gasoline depend on his income level? to answer these questions, find the cross-partial derivative, |partial differential^2 g/partial differential m partial differential p_g.