Adecision is made at the margin when each alternative considers:
a. a different trade-off than the others.
b. where the most costly alternative will be.
c. what the all or nothing alternative will be.
d. cost and benefit ranked in progressive units.

answer; blank(1); /// whitelisting; blank(2); // blacklisting;

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;