0 in a way that is too expensive or too much:
The cost of printing books in one-country languages is prohibitively high.
It is an expensive car to run, although not prohibitively so.
Winning an election against an incumbent can become prohibitively difficult.
This would reduce the problem once more to determining sequences of scalars and, if one chooses well, their number need not be prohibitively large.
For more complicated constructions, such as the interpretation of polymorphic and recursive types, it appears that our external approach would become prohibitively overburdened with detail.
For example, without further optimization such an implementation is prohibitively inefficient in terms of storage consumption when large arrays are used.
Sample sizes are in general prohibitively small, and the informative matings will not always be available.
For structures with the total number of members that we are considering, the computation time for global optimization is prohibitively long.
