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pm Points 100 Submitting an external tool Available Oct 16 at 12am - Oct 19 at 11:59pm 46:58 44/50 Content attribution QUESTION 43 . 1 POINT The bowed out shape of the production possibilities frontier (PPF) illustrates the concept of Select all that apply. Select all that apply: increasing marginal opportunity cost diminishing marginal opportunity costs O increasing marginal returns diminishing marginal returns FEEDBACK Content attribution revious O W T 73OF