Question

Along the production possibility frontier, trade-offs exist because of what?

Answer 1

(a) buyers will want to buy less when price goes up, but producers will want to sell more.
(b) even on the frontier itself, not all production levels are efficient.
(c) at some levels, unemployment or inefficiency exists.
(d) the economy has only a limited quantity of resources to allocate between competing uses.

Answer 2

You should be able to remove B from the group due to assumed level of efficiency