See
also: List of Economic Topics 
CONSUMER
AND PRODUCER SURPLUS - ECONOMIC SURPLUS
microeconomics
The
term surplus is used in economics for several related quantities. The consumer
surplus is the amount that consumers benefit by being able to purchase a product
for a price that is less than they would be willing to pay. The producer surplus
is the amount that producers benefit by selling at a market price that is higher
than they would be willing to sell for.
If
the government intervenes, using, for example, a tax or a subsidy, then the graph
of supply and demand becomes more complicated and will also include an area that
represents government surplus.
Combined,
the consumer surplus, the producer surplus, and the government surplus (if present)
make up the social surplus or the total surplus.
A
basic technique of bargaining for both parties is to pretend that their surplus
is less than it really is: sellers may argue that the price they asks hardly leaves
them any profit, while customers may play down how eager they are to have the
article.
See
also
microeconomics
price discrimination
price skimming
negotiation