Oil trader on NPR Morning Edition (Tuesday, August 9, 2016):

Paraphrase: You can't have three phone conversations at once, but you can have three, or ten, chat windows open at once. It multiplies the number of trades you can make by ten. 

Hence, technology decreases opportunity cost.

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Rahsaan Roland Kirk plays up to three saxes at once. He is his own sax section, his own reverb.

Before Kirk, the "Production Possibility Frontier (PPF)" was limited to one man playing one saxophone at one time, or one man playing two saxophones at different times. Kirk expanded the possibility by 100% (playing two at once) or 200% (playing three at once). He also sings and plays a nose flute simultaneously (see "I Aye Eye" Montreaux Jazz Festival video on youtube).

The "opportunity cost" of choosing to sing or, exclusively, playing a flute. has dropped to zero.

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Therefore, we should not consider Production Possibility Frontier in policy-making. Production Possibility Frontier figures say more about the calculator's own frontiers than about production possibility.