6. It arises mainly because resources are scarce or limited
a. Marginal cost
c. Efficient market
b. Oppotunity cost
d. None of these are correcy
7.1 is often clled "what is" economics
a. Marginal cost
c. Efficient market
b. Oppotunity cost
d. None of these are correcy
7.1 is often clled "what is" economics
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letter a i'm not sure kung tama ba ang answer ko