PPC

Production Possibilities Curve (PPC) — also called Production Possibilities Frontier (PPF). A diagram showing the maximum combinations of two goods or services that an economy can produce when ALL its resources are fully and efficiently employed, using the current state of technology.

Axes. Two goods on the X and Y axes (e.g. capital goods vs consumer goods; healthcare vs education).

Points and their interpretation:

Point	Meaning
On the curve (A, B)	Productive efficiency — all resources fully employed, no waste
Inside the curve (X)	Unemployment / underutilisation of resources
Outside the curve (Y)	Currently unattainable — beyond the economy's capacity

Bowed-outward (concave) shape. Reflects the law of increasing opportunity cost — resources are not equally suited to producing both goods. Moving from producing all of good A to all of good B requires giving up increasing amounts of A for each additional unit of B (because the resources best suited to A become less productive when redeployed to B).

Straight-line PPC would imply constant opportunity cost — possible only when resources are perfectly substitutable (rare in reality).

Movement ALONG the PPC (from one efficient point to another, e.g. A to B):

• Same resources reallocated between the two goods.
• Opportunity cost: must give up some of one good to produce more of the other.

Movement FROM INSIDE the curve TO the curve (X to A):

• This is actual growth — using existing capacity more fully.
• E.g. reducing unemployment, eliminating waste, using idle factories.

OUTWARD SHIFT of the entire PPC:

• This is potential growth — the economy's productive CAPACITY has increased.
• Caused by:
  • More resources — labour force growth (immigration, higher participation), discovery of natural resources, new capital investment.
  • Better resources — education and training (improves labour quality); R&D and technology (improves productivity).
• The whole curve shifts outward; previously unattainable combinations become possible.

INWARD SHIFT:

• War, natural disaster, mass emigration, capital destruction.

Asymmetric shift — sometimes only one axis shifts. E.g. an advance in healthcare technology shifts the PPC outward more on the healthcare axis than on the consumer-goods axis.

Consumer vs capital goods PPC. A classic IB illustration:

• An economy that produces MORE capital goods today (machines, factories) sacrifices consumer goods today.
• BUT increased capital → higher productive capacity → PPC shifts outward more in the future.
• Trade-off: present consumption vs future growth.

Connecting to the 9 key concepts. PPC illustrates:

• Scarcity (resources are limited; curve bounds production).
• Choice (which point on the curve to operate at).
• Efficiency (on the curve).
• Change (shifts over time).