ECON1101 Chapter Notes - Chapter 10: Pay Television, Private Good, Marginal Cost

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18 May 2018
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ECON1101
Chapter 10: Imperfectly Competitive Markets (Public Goods)
Non-Rivalry and Non-Excludability
Private goods are rivalrous and excludable
A good is rivalrous if its consumption prevents someone else
from consuming it
A good is excludable if you can exclude someone else for
consuming it
Public goods are neither rivalrous or excludable
Non rivalry - one individual’s consumption of the good does not
impede another individual from consuming it as well: the
marginal cost of providing the public good to an additional
individual is equal to zero
Non-excludability - no one can be excluded from consuming
the good
Goods that are perfectly
non rivalrous and non excludable are called
pure public goods
Goods that are non rivalrous and non excludable up to a point are
called impure public goods
Some goods are non rivalrous but are excludable - a typical
example is pay TV where unless you pay a subscription, you
can be excluded. However, it is not rivalrous because your
consumption doesn’t stop someone else from consuming it
Some goods are non excludable but are rivalrous. An example
is a motorway where anyone can access it (assuming there are
no tolls) but as you consume it, you stop others from doing the
same (congestion)
Typically, most public goods are only pure up to a point (very rare for
a good to be perfectly public)
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Document Summary

A good is rivalrous if its consumption prevents someone else from consuming it. A good is excludable if you can exclude someone else for consuming it. Public goods are neither rivalrous or excludable. Non rivalry - one individual"s consumption of the good does not impede another individual from consuming it as well: the marginal cost of providing the public good to an additional individual is equal to zero the good. Non-excludability - no one can be excluded from consuming. Goods that are perfectly non rivalrous and non excludable are called. Goods that are non rivalrous and non excludable up to a point are pure public goods called impure public goods. Some goods are non rivalrous but are excludable - a typical example is pay tv where unless you pay a subscription, you can be excluded. However, it is not rivalrous because your consumption doesn"t stop someone else from consuming it. Some goods are non excludable but are rivalrous.

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