General Contractors (GC) and Holly enter into an oral contract under which Holly agrees to work on a GC Project for 16 months. This contract is enforceable by:

answer; ///(d); determining who competes most closely   with whom evaluating whether industry driving forces and competitive pressure favor some strategic groups and hurt others, and ascertaining whether the profit potential of different strategic groups varies due to the strengths and weaknesses in each groups respective market positions;

answer; is the sum of all individual demands curves;

answer; signaling;