ECON1101 Final: ECON1101 final exam notes covering all textbook and lecture materials

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SEM 1 2018 UNSW
ECON1101 – MICROECONOMICS 1
ECON1101 MICROECONOMICS 1
PART 1 OPPORTUNITY COST AND COMPARATIVE ADVANTAGE
CH 1.COMPARATIVE ADVANTAGE AND THE BASIS FOR TRADE
1.1 One Agent Economy
- Assumptions:
1. Only 2 possible activities (e.g. collecting bananas – 1kg/hr and catching rabbit – 1kg/2hr)
2. Only 2 individuals (e.g. Alberto and Leo)
3. No transaction costs when trading (e.g. negotiation time, transportation costs) and other barriers (e.g.
import quotas and tariffs)
Efficient production
point
- Represents a combo of goods for which currently available resources DO NOT allow an
increase in the production of one good without a reduction in the production of another
- There is no wastage of resources
- All the points on the PPC are efficient
Inefficient
production point
- Represents a combo of goods for which currently available resources ALLOW an increase
in the production of one good without an reduction in the production of the other
- All the points below and to the left of PPC are inefficient
Attainable
production point
- Represents any combo of goods that can be produced with the currently available
resources
- Both efficient and inefficient points are attainable points
Unattainable
production point
- Represents any combination of goods that cannot be produced with the currently
available resources
- Points to the above the PPC are unattainable
1.2 Two Agents Economy
-Specialisation: the process in which agents in an economy concentrate on producing goods or services at which
they perform the best at relative to others
oThey can then satisfy their needs for other goods and services by trading among themselves
Absolute advantage Comparative advantage
pg. 1
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SEM 1 2018 UNSW
ECON1101 – MICROECONOMICS 1
- When an agent (or an economy) can carry on a
productive activity with less resources (e.g. less
time) than another agent
- When an agent (or an economy) has a lower OC of
carrying on a productive activity than another
agent
-Opportunity cost: the value of the next best alternative to a given action
oE.g. If Alberto spends 2hrs catching rabbits he gets 1kg but misses out on the opportunity to spend those 2
hrs collecting 2kg of bananas instead.
Alberto’s opportunity cost of 1kg of rabbit is 2kg of bananas
-OC of an activity = gradient of the PPC
- OC of activity 1 can be calculated by taking the inverse of the OC of activity 2
- The agent with the lowest OC at producing something should go on and produce it as this will result in gains from
specialisation
-Principle of Comparative Advantage: states that everyone is better off if each agent/country specialises in the
activities for which they have a comparative advantage
Q) Explain how the PPC illustrates the concept of opportunity cost
- Because the PPC represents the maximum output possibilities, the curve clarifies that an increase in production
of one good will lead to an increase in forgone production of another good
oi.e. In order to produce more of one good, we must produce less of another
oThus, the opportunity cost of producing one good will get bigger and bigger
- Slope of the PPC = OC of an extra unit of a good as it tells us how much less of one good is produced in order for
one more unit of the other good to be produced
-Note: slope of the PPC is negative/downward sloping
oThis is because producing more of one good will ALWAYS result in fewer resources available to produce
another good
oThis means OC of producing more of one good is positive (ask someone to clarify this)
-Example (Q6 of tutorial questions) – what is the tailor’s OC of producing shirts in terms of trousers?
pg. 2
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SEM 1 2018 UNSW
ECON1101 – MICROECONOMICS 1
oFirst, we must find the slope of the PPC  , which tells us that the tailor must give up 2.5 shirts for every
additional pair of trousers she produces (i.e. OC of trousers)
oProducing an additional shirt requires giving up  pairs of trousers
1.3 Trading in A Two-Agent Economy
- When purchasing a good, it will be worthwhile to buy it as long as the price of the good is less than the OC of
producing that product
- For example, considering the scenario we have been looking at:
oLeo is buying bananas since he specialises in rabbits
oLeo’s OC for rabbit is 1kg of banana
o Leo will want to buy 1kg of bananas for no more than 1kg of rabbits
- When selling a good, it will be worthwhile to sell at a price that is more than the OC for producing that product
- For example:
oAlberto is selling bananas since he specialises in this
oAlberto’s OC of 1kg of bananas is 0.5kg of rabbits
oAlberto will want to sell 1kg of bananas for at least 0.5kg of rabbits
- The cost of a product should be greater than or equal to OC of seller and less than or equal to the OC of buyer in
order for both agents to be better off specialising (OCGood seller Price of good OCGood buyer)
Q) Tutorial question 7 – Suppose that Joshua spends 10hrs/day picking fruit. He can pick 1kg/hr of apples and
1kg/2.5hrs of cherries
a) What is Joshua’s opportunity cost of picking apples in terms of cherries?
oIn the time is takes to pick 1kg of apples, Joshua could produce kg of cherries
b) At his local farmer’s market, Joshua can buy or sell as much fruit as he wants at a price of $4/kg for apples and
$8/kg for cherries. If Joshua only wanted to consume apples, how many of each fruit should Joshua pick?
oIn the market, price of apples in terms of cherries is $/$8 = 0.5kg of cherries per kg of apples
pg. 3
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