Because when one produces one product, the opportunity cost of the other product increases i.e. the concave represents the increasing opportunity cost with the production of a good.
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The PPF is bowed outwards (concave to the origin) as tradeoffs between the production of any two goods are constant.
no
Yes, they do.
The point when a curve changes from concave upward to concave downward is called the inflection point. It is the point where the curve transitions from being curved "upwards" to being curved "downwards" or vice versa. At the inflection point, the rate of change of the curve's curvature changes sign.
Assumptions to determine the PPC is:only 2 goods will be illustratedthe amount of resources is fixedstate of technology is constant