There is no shift in the PPC.Only a dot is marked within the curve(Not on the curve) in the exact center of the two axes.The shape of the PPC is concave to the origin.
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Ppc slopes downward due to the following reasons: 1. Substitution effect. 2. Income effect. 3. Diminishing marginal utility.
PPC curve slopes downward for the efficient resouress of another commidty
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Assumptions to determine the PPC is:only 2 goods will be illustratedthe amount of resources is fixedstate of technology is constant
The production possibility curve (PPC) is a two dimensional model, showing how resources can be used to produce two different goods or services or types of good and services. The graph is bowed outwards due to a basic concept used in economics - the principle of increasing cost. If a producer were to produce more of one good or service, the constant in resources and technology would not be able to maintain the previous amount of production of the other good or service. If more of one good or service is produced, the opportunity cost of the reduction of the other good or service increases, therefore the gradient of the curve increases.