The fact that Alice spends no money on travel:

A) implies that she does not derive any satisfaction from travel.
B) implies that she is at a corner solution.
C) implies that her MRS does not equal the price ratio.
D) Any of the above are possible.

Corner Solution

In optimization problems, a situation where the optimal choice for a variable is at the limit or bound of its possible values, rather than in the interior of the choice set.

MRS

The speed at which a consumer is prepared to exchange one product for another while keeping the same degree of happiness or utility.

Travel

The act of moving from one place to another, which can be for various purposes such as leisure, business, or exploration.