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marginal revenue = price

The formula for marginal revenue is:

marginal revenue =  change in total revenue change in quantity
Price Quantity Total Revenue Marginal Revenue
$4 1 $4 -
$4 2 $8 $4
$4 3 $12 $4
$4 4 $16 $4

Notice that marginal revenue does not change as the firm produces more output. That is because the price is determined by supply and demand and does not change as the farmer produces more (keeping in mind that, due to the relative small size of each firm, increasing their supply has no impact on the total market supply where price is determined).

Since a perfectly competitive firm is a price taker, it can sell whatever quantity it wishes at the market-determined price. Marginal cost, the cost per additional unit sold, is calculated by dividing the change in total cost by the change in quantity. The formula for marginal cost is:

marginal cost =  change in total cost change in quantity

Ordinarily, marginal cost changes as the firm produces a greater quantity.

In the raspberry farm example, shown in [link] , [link] and [link] , marginal cost at first declines as production increases from 10 to 20 to 30 packs of raspberries—which represents the area of increasing marginal returns that is not uncommon at low levels of production. But then marginal costs start to increase, displaying the typical pattern of diminishing marginal returns. If the firm is producing at a quantity where MR>MC, like 40 or 50 packs of raspberries, then it can increase profit by increasing output because the marginal revenue is exceeding the marginal cost. If the firm is producing at a quantity where MC>MR, like 90 or 100 packs, then it can increase profit by reducing output because the reductions in marginal cost will exceed the reductions in marginal revenue. The firm’s profit-maximizing choice of output will occur where MR = MC (or at a choice close to that point). You will notice that what occurs on the production side is exemplified on the cost side. This is referred to as duality.

Marginal revenues and marginal costs at the raspberry farm: individual farmer

The market-level graph shows that the equilibrium price ($4.00) is determined through the interaction between market demand and market supply.
For a perfectly competitive firm, the marginal revenue (MR) curve is a horizontal straight line because it is equal to the price of the good, which is determined by the market, shown in [link] . The marginal cost (MC) curve is sometimes first downward-sloping, if there is a region of increasing marginal returns at low levels of output, but is eventually upward-sloping at higher levels of output as diminishing marginal returns kick in.

Marginal revenues and marginal costs at the raspberry farm: raspberry market

The firm-level graph shows how a firm uses the market price to determine its profit-maximizing level of output.
The equilibrium price of raspberries is determined through the interaction of market supply and market demand at $4.00.
Marginal revenues and marginal costs at the raspberry farm
Quantity Total Cost Fixed Cost Variable Cost Marginal Cost Total Revenue Marginal Revenue
0 $62 $62 - - - -
10 $90 $62 $28 $2.80 $40 $4.00
20 $110 $62 $48 $2.00 $80 $4.00
30 $126 $62 $64 $1.60 $120 $4.00
40 $144 $62 $82 $1.80 $160 $4.00
50 $166 $62 $104 $2.20 $200 $4.00
60 $192 $62 $130 $2.60 $240 $4.00
70 $224 $62 $162 $3.20 $280 $4.00
80 $264 $62 $202 $4.00 $320 $4.00
90 $324 $62 $262 $6.00 $360 $4.00
100 $404 $62 $342 $8.00 $400 $4.00

Questions & Answers

what is the effect of inflation in GDP
ahmed Reply
Not only real GDP but also nominal GDP will decrease
Aqib
yep. Inflation has an influence not only GDP but interest rate also.
Hamza
The pound weakens so imports become more expensive and exports lose value - lower GDP.
Rebecca
why do inflation effect economic
Chelsea Reply
explain in detail what is economic what is scarcity what is alternate uses
Ejiro Reply
What is law of demand
Hilary
economic as a science refers to study of human resource
Kaunda
Law of demand- With all the factors remaining same if price increases of a commodity, the quantity of demand of that commodity decreases and vice versa
Dey
Thanks dey sunita
Hilary
What is law of supply
Hilary
what are the factors that affect demand
Elly Reply
what are the factors that affect demand of a good
Elly
what are the factors that affect demand of a good
Elly
what are the factors that affect demand of a commodity
Elly
1. the price of the product 2. the price of other products 3. consumers income 4. expectation of future changes in price 5. taste and preference etc.
ALI
Change in price
Hilary
1. price related of commodities 2. consumers income 3. the condition or season of the commodities
Tsai
decrease in demand of substitute increase in demand of constituent change in quantity and other environmental factors
Hamza
Nd consumer's income
Hamza
what course scarcity
Bashari Reply
Scarcity is the limited availability of a commodity, which may be in demand in the market or by the commons. Scarcity also includes an individual's lack of resources to buy commodities. The opposite of scarcity is abundance.
Marc
Reasons that explain why the division of labor increases an economy's level of production
Chukwuka Reply
Please I don't understand the meaning and the concept of economics as a science
Ophelia Reply
economics as a science refers to the study of human behavior. how they make decisions etc
Saidou
economics is science because it uses scientific methods in analysing societal problems.. observation experimentation and conclusion inherently are used to analyse. however it is not pure science but social science because it studies human and it's environs
Bonney
what's elasticity of demand
Isaac Reply
are u asking because you don't know or what
Stephen
A measure of the responsiveness of a product demanded to a change in market price
Yuusuf
the degree of responsiveness of a product demanded to a little change in the price
Saidou
the degree of responsiveness of quantity demanded of a commodity to the changes in the price if the commodity in question, changes in the price of other related commodities and changes in the income of consumer
Bonney
what is international trade
Kwame Reply
international trade is a trade between foreign country
IYke
it is the exchange of goods and services between countries
Bonney
it's the exchange of goods and services from one foreign country to another
Israel
how is demand run
Ogonna Reply
what s the causes of poverty for human being
Femi Reply
lack of knowledge and resources
Asrat
it is lack of inclusive political and economic institutions in that country given a strong central government.
tesfaye
luck of economics
Donkor
poverty is due to poor system of taxation
Hamza
progressive system of taxation can reduce poverty
Hamza
lack of knowledge
IYke
Isn't it poor system of taxation that causes poverty
Chukwuka
How is a monopoly market different from an oligopoly one?
Antony Reply
Qn.5.a)explain four ways on how elasticity of demand determines the incidence of tax b)design five mechanisms that can be uxed to reduc the gvt expendture in develping countriex lik tz
ALLY
l dont know can l have brief notes
Hilda
What is anatomy and physiology
emeka Reply
Important of monopoly
Daniel Reply
Importance of monopoly
Ibrahim Reply

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Source:  OpenStax, Principles of economics. OpenStax CNX. Sep 19, 2014 Download for free at http://legacy.cnx.org/content/col11613/1.11
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