Vocabulary/Name for Utility of a Set of Choices I am trying to find if there is some litterature or definition of the concept of the Utility of a set of choices. My google searches return nothing, and I expect it is because I do not know the right word. 

Here is an example to illustrate what I am looking for.



Consider the following items; a very nice sport car, Car1, the same model of car, only without some options such as no A/C and slightly worse seats, Car2, and a worn off pickup, Truck.

Say that all those vehicles have some associated utility, say

u(Car1) = 500, u(Car2) = 490, u(Truck) = 100


While Car2 is very good in isolation, it is dominated by Car1 and very unlikely that anyone would pick Car2 over Car1. The Truck, on the other hand, has a low value but might be picked over Car1 under some circumstances.

Hence, the utility of the set of choices {Car1, Truck} should be higher than the value of the set {Car1, Car2} even if it contains lower quality items as the truck might actually be helpful.



The assumption here is that the single value of utility associated with the item does not tell us exactly how the user makes its choice. We could assume for example that the utility of a vehicle is 2-dimensional and consists of Niceness of the vehicle and Carrying capacity.

The total utility of the vehicle is the sum of the utility provided by those two features, but the decision process might be more complicated and not follow the Independance of Irrelevant Alternatives/Luce Choice Axiom and would follow a model where correlation among options is possible.
What you seem to be interested is the subfield of decision theory that goes by the name of "menu choice." The starting point of this literature is the paper

Kreps, David M. "A representation theorem for preference for flexibility." Econometrica: Journal of the Econometric Society (1979): 565-577.

This paper might be directly relevant to the problem you want to address.