Assumptions of Perfect Competition
The most competitive market structure is pure or perfect
competition, which is as competitive as possible. As previously mentioned, market structures
are models that summarize how certain markets are organized and behave. For each market structure we have a set of
assumptions or characteristics that tell us what kind of industries the model
will explain. Only industries that meet
the assumptions will behave in the way the model predicts. The assumptions of perfect competition are:
Many buyers and
sellers: There are so many buyers
and sellers in perfect competition that no one of them has any influence
whatsoever on the market. The number of
consumers and producers is so great that any one of them is like a cup of water
in the ocean – their presence or absence makes no difference at all to the
market.
Identical or homogenous
product: Every producer in the
market makes exactly the same product – consumers are not able to distinguish
between the output of one firm and the output of another. There are no labels, brands or any other
distinguishing features used to make a product look distinct.
Excellent information: Both buyers and sellers in this market have
good information about the product, especially the fact that there are many
other producers all making the same product.
Relatively free entry and
exit: Firms are able to move
resources in and out of this market relatively easily with little expense. This makes firms especially quick to respond
to changing consumer demand.
As you would expect from this list, there are few markets
that come close to fitting these assumptions.
The most common example used for perfect competition is
agriculture. While agriculture does not
fit these assumptions perfectly, it comes closer to perfect competition than to
any other market structure.
In the major commodity markets, there are so many
producers that any one producer has no effect on the market. If you are one producer of hard red winter
wheat out of thousands, it does not affect market supply or price if you
produce more or less this year. You are
so insignificant to the market that you cannot even set your own price, but
have the price set for you in the market – perfectly competitive firms are price
takers, their only choice is to take the market price and sell, or leave it
and sell nothing.
In the major commodity markets the product is identical
from producer to producer – there is no difference in the hard red winter wheat
of Farmer Smith in Nebraska and Farmer Jones in South Dakota. If consumers were presented with a bucket of
each, they could not tell any difference.
In the major commodity markets, all the buyers know that
the product is identical, they know what current prices are, and they know how
to grade the product. If the going price
of hard red winter wheat were $3 a bushel, a farmer who tried to set his/her
price at $3.01 a bushel would sell no wheat.
All the buyers know they can get all the wheat they want at $3. Producers have no power over the market
price.
In the major commodity markets there is relatively free
entry and exit, stress on the word relatively.
While it is expensive to enter and exit farming in general, it is
relatively inexpensive to move from one agricultural market to another related
one. For example, areas suitable to
growing corn are generally also very suitable to grow soybeans. Similar equipment is used to plant, cultivate
and harvest corn and soybeans. If corn
prices have been low, corn farmers could easily switch to growing soybeans the
next year.
In recent years we have seen a growing deviation from the
perfect competition pattern in agriculture in that the buyers of agricultural
crops are consolidating in some markets.
For example, there are a limited number of meat processors that handle
pork and poultry reducing the competition on the buying side of the
market. In time, we may have to adjust
our interpretation of at least some of the agricultural markets, but for the
moment the best fit still appears to be perfect competition.
In general, the pattern for this market is a very large
number of small powerless producers making absolutely the same product in a
market where they have no influence on price.
Competition is so great that individual firms have no alternative but to
operate efficiently in order to survive.















