Introduction to microeconomics

Июль 27, 2022

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Экономика
Introduction to microeconomics

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2. Economic Efficiency An economy, or economic process, is operating efficiently if it cannot make more of
3. Opportunity Cost The quantity of a good we must sacrifice to obtain one more unit of
4. Economic Models Models are simplified representations of reality, used to study and understand relationships in the
5. Example: A simplified economy with limited resources for production. Resource: 100 workers who can pick berries
6. The available technology: Workers [W]: 1 W => 1 bushel of berries per day or 1
7. If all of our resources were used to produce fish: 100W*[1 pound per day/W]+50N*[2 bushel per
8. We would like to know all the possible combinations of fish and berries our society can
9. When we transfer a worker from fish to berry production: We give up one pound of
10. Production Possibilities Curve (PPC): A graph of all economically efficient combinations of goods the society is
12. Rate of Transformation: [Change in pounds of fish per day]/[Change in bushels of berries per day]
13. The PPC will shift outward: If additional productive resources are made available. If current available resources
14. Suppose our technology changes so that Nets become more productive than they were previously. The new
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Economic Efficiency
An economy, or economic process, is operating efficiently
if it cannot

make more of one good without making less
of another.

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Opportunity Cost
The quantity of a good we must sacrifice to obtain
one

more unit of some other good.

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Economic Models
Models are simplified representations of reality, used
to study and understand

relationships in the real world.
Models are, by nature, abstractions. The trick is choosing
the correct level of abstraction.
Most economic models are built with mathematics; graphs
and equations.

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Example: A simplified economy with limited resources for production.
Resource: 100 workers

who can pick berries or catch fish.
50 nets for collecting fish or berries.

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The available technology:
Workers [W]: 1 W => 1 bushel of berries

per day
or
1 W => 1 pound of fish per day
Nets [N]: 1 N => 1/2 bushel of berries per day
or
1 N => 2 pounds of fish per day

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If all of our resources were used to produce fish:
100W*[1

pound per day/W]+50N*[2 bushel per day/N]
=> 200 pounds of fish per day

If all of our resources were used to produce berries:
100W*[1 bushel per day/W]+50N*[1/2 bushel per day/N]
=> 125 bushels of berries per day

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We would like to know all the possible combinations of fish
and

berries our society can produce.
As we transfer resources from fish production to berry production,
we will transfer the least productive fish producers first.
In our example, this means we will transfer workers first.
We will continue transferring workers until only workers are picking
berries and all nets are being used to catch fish.
If we want still more berries, we must shift nets from fish production
to berry production. The terms of the trade-off of fish for berries
will worsen.

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When we transfer a worker from fish to berry production:
We

give up one pound of fish and we gain one additional bushel of berries.
This implies that 1 pound of fish = one pound of berries.
When we transfer a net from fish to berry production:
We give up two pounds of fish and we gain 1/2 additional bushel of berries.
This implies that 4 pounds of fish = 1 bushel of berries

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Production Possibilities Curve (PPC):
A graph of all economically efficient

combinations of goods the society
is able to produce.
The changes in slope in the diagram tell us how the rate of exchange, or
rater of transformation of goods, between fish and berries changes as
we continue to transfer resources from one product to the other.
The Rate of Transformation on the PPC is the rate of economically
efficient exchange; it tells us the Opportunity Cost of one good in
terms of another.

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Rate of Transformation:
[Change in pounds of fish per day]/[Change

in bushels of berries per day]
as we move along the PPC
In other words, it is the slope of the PPC.
On the upper part of the curve, the slope is -1
On the lower part of the curve, the slope is -4
The Rate of Transformation measures the amount of one good we must
sacrifice to get one unit of the other, or, the Opportunity Cost.
The Opportunity Cost of one bushel of berries is one pound of fish on the
upper part of the curve, and 4 pounds of fish on the lower part of the curve.

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The PPC will shift outward:
If additional productive resources are made available.
If

current available resources become more productive.
If more productive ways of combining resources are found.

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Suppose our technology changes so that Nets become more
productive than

they were previously.
The new technology is:
1 N => 1 bushel of berries per day [instead of 1/2 bushel/day
or
1 N => 2 pounds of fish per day [same as before]

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