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--"IGCSE ECONOMICS REVISITED!"--
--1.5.1 NATURE/MEANING OF THE PPC--
--1.5.1 NATURE/MEANING OF THE PPC--
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"The 'PRODUCTION POSSIBILITY CURVE (PPC)' also known as the PRODUCTION POSSIBILITY FRONTIER (PPF), is an economic model used to illustrate the economic concepts of FACTORS OF PRODUCTION, SCARCITY, CHOICE, and OPPORTUNITY COST."
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"This model condenses the output of an entire economy into two categories (e.g., capital vs. consumer goods) and then plots the various combinations that the economy can produce given its LIMITED FIXED STOCK OF RESOURCES within a chosen time period. It clearly illustrates 'choice,' 'trade-offs,' and 'opportunity costs.'"
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"Let's start with imagining a simple island economy that can produce either 🍏 or 🍓 on a 'per day' basis..."
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('Insert image of labeled axis')
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"We can start with determining the maximum output that could be produced if 100% of the resources (in this example, 10 laborers) were devoted to the production of each of the goods; in this case, we have either 100 🍏 or 100 🍓 per hour."
('Insert image of axis with extremes)
--1.5.2 CONSTANT & INCREASING OPPORTUNITY COST--
--1.5.2 CONSTANT & INCREASING OPPORTUNITY COST--
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"So what about the other 'trade-off combinations' between these two maximums?"
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"If you give up/forgo 🍏, how many additional 🍓 can you produce, and vice versa?" "Well, if the trade-off between the two goods is 'constant,' at say 'one for one', then what would the PPC look like?"
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"Correct! It's a 'straight line' with a 'gradient of one,' 100/100; in other words, the trade-off (aka the opportunity cost) is CONSTANT, for every additional +1 🍏, we forgo a -1 🍓, and vice versa."
('Insert constant returns ppc')
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"But for this to be the case, 'CLONING' 😶😶😶😶😶😶 would need to be legal as all the workers MUST be equally suitable for producing both products, and the opportunity costs would be identical like the table below."
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"...in other words the assumption that creates the constant straight PPC is not realistic, as not all resources/workers are the same in terms of productivity ('imperfect factor mobility')."
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"If we assume that 'HEIGHT' has the biggest influence on the relative productivity of each labour resource, with taller people being more suitable for 🍏-picking and shorter people being more suitable for 🍓-picking you should realise that with impefect factor mobility we will employ better 🍏 pickers, to pick 🍓 and vice versa.
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"...and in terms of opportunity cost, when we employ taller and taller workers to pick 🍓 what do you think happens to the opportunity cost in terms of 🍏?"
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"That's right, it INCREASES, in other words there exists INCREASING OPPORTUNITY COSTS."
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"So what does this do to the shape of the PPC?"
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--TASK--
"Below is a table showing the productivities of workers with different heights and corresponding productivity levels. Now, using graph paper plot the PPC and explain the shape in terms of increasing opportunity cost!"
--1.5.3 SHIFTS/PIVOTS IN THE PPC--
--1.5.3 SHIFTS/PIVOTS IN THE PPC--
OUTWARD SHIFT
These are changes that allow the economy to produce more apples and/or strawberries than before.
--TASK--
"If we continue our example of the simple island economy that can produce either 🍏 or 🍓 on a 'per day' basis..."
1. More labour (largest and easiest example)
Instead of 10 workers, the economy now has 12.
Perhaps two new workers immigrate.
Old economy:
10 workers
New economy:
12 workers
The economy can now produce more of both goods.
Story
Two new workers arrive in the village. Regardless of whether they specialize in apples or strawberries, total production increases."
2. Better education or training (human capital)
The workers become more skilled.
Perhaps everyone attends a harvesting academy.
Before:
Tall worker picks
80 apples/day
After training
Same worker picks
100 apples/day
Short workers also become faster at strawberries.
Everyone becomes more productive.
The PPC shifts outward.
3. Better tools (physical capital)
Workers receive
taller ladders
lighter baskets
mechanical pickers
Now every worker gathers more fruit per hour.
Example
Before
Worker 4
60 apples
After ladder
85 apples
Again, productive capacity increases.
4. Better technology
The village invents
apple-picking drones
GPS harvesting
automated sorting
Each worker wastes less time.
Output rises.
5. Discovery of more land
The village discovers another orchard and another strawberry field.
There are simply more resources available.
Even without improving workers, more fruit can now be harvested.
6. Better organisation / entrepreneurship
Workers are organised more efficiently.
Instead of everyone walking long distances carrying baskets,
entrepreneurs introduce
collection stations
tractors
better routes
Less time is wasted.
Productivity rises.
7. Health improvements
Workers receive vaccinations or improved healthcare.
They miss fewer working days.
They work faster.
Human capital becomes more productive.
INWARD SHIFT
These are changes that cause the economy to produce fewer apples and/or strawberries than before.
--TASK--
Causes of an Inward Shift in the PPC
These reduce the economy's productive capacity.
1. Labour force falls
Perhaps three workers retire.
Now only seven workers remain.
Maximum production falls.
2. Workers become ill
A disease spreads.
Workers become weaker and slower.
Instead of
80 apples/day
they now collect
55 apples/day.
The entire PPC shifts inward.
3. Natural disaster
A storm destroys
apple trees
strawberry fields
There are fewer resources available.
Maximum output falls.
4. Capital destroyed
The ladders burn down.
The tractors break.
Workers must harvest manually.
Productivity falls.
5. Technological regression
Perhaps machinery can no longer be repaired.
The economy reverts to older methods.
Output falls.
6. Emigration
Some workers leave the village.
Instead of 10 workers,
only 8 remain.
The economy can produce less.
7. War
Several workers are drafted away.
Fields are damaged.
Equipment is destroyed.
Productive capacity contracts sharply.
PIVOT
These are changes that allow the economy to produce more apples and/or more strawberries than before.
An Advanced Teaching Point
You can also illustrate biased economic growth, where the PPC shifts outward unevenly:
Apple-specific innovation (e.g. robotic tree pickers) increases only apple productivity, causing the PPC to pivot outward more on the apple axis.
Improved strawberry varieties increase only strawberry productivity, causing the PPC to pivot outward more on the strawberry axis.
General productivity improvements (e.g. healthier workers or better management) increase productivity in both activities, shifting the entire PPC outward.
This distinction helps students understand that not all economic growth affects every sector equally—a key insight for A Level Economics.
--1.5.4 POSITIONS WITHIN THE PPC--
--1.5.4 POSITIONS WITHIN THE PPC--
--1.5.4 POSITIONS WITHIN THE PPC--
--1.5.4 POSITIONS WITHIN THE PPC--
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