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How To Draw A Demand Curve

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How To Derive An Individuals Demand Curve From The Indifference Curve Analysis

Drawing a demand curve

A demand curve depicts how much quantity of a commodity will be bought or demanded at various costs, presuming that the proclivity and tastes of a customers income and costs of all goods remain the same .

The demand curve that depicts a clear association between the cost and quantity demanded can be obtained from the price utilisation curve of the indifference curve analysis.

According to the Marshallian utility analysis, the demand curve was derived on the presumption that utility was cardinally quantifiable and the marginal utility of money lasted constantly with the difference in price of the commodity. In the indifference curve analysis, the demand curve is derived without making these uncertain presuppositions.

Also read :;Do you know the law of demand?

Suppose a person is consuming apples and bananas , and that persons income is N and the market prices of X1 and X2 are P1 and P2 respectively. Figure portrays their consumption equilibrium at point C, where they buy the X1 and X2 quantities of apples and bananas, respectively. In console of the figure, we plot P1 against X1, which is the first point on the demand curve for X1.

This is detailed and elucidated information on the concept of Deriving a Demand Curve from Indifference Curves and Budget Constraints. Stay tuned to BYJUS to learn more.

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Factors Affecting Market Demand

In addition to the factors which can affect individual demand there are three factors that can cause the market demand curve to shift:

  • a change in the number of consumers,
  • a change in the distribution of tastes among consumers,
  • a change in the distribution of income among consumers with different tastes.

Some circumstances which can cause the demand curve to shift in include:

  • Increase in price of a complement
  • Increase in income if good is inferior good

What Is A Supply Curve

A Supply Curve is a diagrammatic illustration reflecting the relationship between the price of a service or goods and its quantity that has been supplied to the consumers over a specified period. Typically, the Supply Curve comprises X and Y axis, where the former represents the price, and the latter shows the quantity of the product that has been supplied.

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How To Draw A Consumer Demand Curve

    A consumer demand curve is a graph that shows the quantity consumers demand, or are willing to buy, of a product at various prices. You can use a demand curve to visually analyze the effects of price changes for your small businesss products and services. The graph displays prices on the vertical axis and quantities on the horizontal axis. The relationship between the two is represented by a single line in the middle. This line always slopes down toward the right due to the law of demand in economics, which states that the quantity demanded increases when the price declines and decreases when the price rises.

    Step 1

    List the prices you could potentially charge for your products in a column on a regular sheet of paper. Write the quantity you estimate your customers would demand at each price in an adjacent column. The quantity demanded can be for any period, such as a week or month. This data represents your demand schedule and is used to create your demand curve. For example, assume your small businesss customers demand 750, 2,250, 3,500, 4,500 and 5,250 units of your products every week at $5, $4, $3, $2 and $1, respectively. Write the prices in one column and the quantities in another.

    Step 2

    Draw a horizontal line that extends the length of your graph paper three lines from the bottom of the page. This is the x-axis. Write Quantity below the line.

    Step 3

    Step 4

    Write 0 below the intersection of the x- and y-axes.

    Step 5

    Step 6

    Step 7

    Step 8


    Key Concepts And Summary

    MN1015 How to draw demand and supply curves in Excel

    Economists often use the ceteris paribus or other things being equal assumption: while examining the economic impact of one event, all other factors remain unchanged for analysis purposes. Factors that can shift the demand curve for goods and services, causing a different quantity to be demanded at any given price, include changes in tastes, population, income, prices of substitute or complement goods, and expectations about future conditions and prices. Factors that can shift the supply curve for goods and services, causing a different quantity to be supplied at any given price, include input prices, natural conditions, changes in technology, and government taxes, regulations, or subsidies.

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    The Aggregate Supply Curve And Potential Gdp

    Firms make decisions about what quantity to supply based on the profits they expect to earn. Profits, in turn, are also determined by the price of the outputs the firm sells and by the price of the inputs, like labor or raw materials, the firm needs to buy. Aggregate supply refers to the total quantity of output firms will produce and sell. The aggregate supply curve shows the total quantity of output that firms will produce and sell at each price level.

    Figure 1 shows an aggregate supply curve. In the following paragraphs, we will walk through the elements of the diagram one at a time: the horizontal and vertical axes, the aggregate supply curve itself, and the meaning of the potential GDP vertical line.

    Figure 1.

    The horizontal axis of the diagram shows real GDPthat is, the level of GDP adjusted for inflation. The vertical axis shows the price level. Remember that the price level is different from the inflation rate. Visualize the price level as an index number, like the GDP deflator, while the inflation rate is the percentage change between price levels over time.

    Understanding The Demand Curve

    The demand curve will move downward from the left to the right, which expresses the law of demandas the price of a given commodity increases, the quantity demanded decreases, all else being equal.

    Note that this formulation implies that price is the independent variable, and quantity the dependent variable. In most disciplines, the independent variable appears on the horizontal or;x-axis, but economics is an exception to this rule.

    For example, if the price of corn rises, consumers will have an incentive to buy less corn and substitute it for other foods, so the total;quantity of corn consumers demand will fall.

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    How To Derive Demand Curve From Price

    This article will guide you about how to derive demand curve from price-consumption curve.


    The price-consumption curve indicates the various amounts of a commodity bought by a consumer when its price changes. The Marshallian demand curve also shows the different amounts of a good demanded by the consumer at various prices, other things remaining the same.

    Given the consumers money income and his indifference map, it is possible to draw his demand curve for any commodity from the PCC.

    The conventional demand curve is easy to draw from a given price demand schedule for a commodity, whereas the drawing of a demand curve from the PCC is somewhat complicated. But the latter methods has an edge over the former. It arrives at the same results without making the dubious assumptions of measurability of utility and constant marginal utility of money.

    The derivation of demand curve from the PCC also explains the income and substitution effects of a given fall or rise in the price of a good which the Marshallian demand curve fails to explain. Thus the ordinal technique of deriving a demand curve is better than the Marshallian method.


    This analysis assumes that:

    The money to be spent by consumer is given and constant. It is Rs 10.

    The price of good X falls.

    Prices of other related goods do not change.

    Consumers tastes and preferences remain constant.

    The Market Demand Curve:

    Positively Sloping Demand Curve:

    Other Factors That Shift Demand Curves

    How to Draw Demand Curves in Excel : Microsoft Excel Help

    Income is not the only factor that causes a shift in demand. Other factors that change demand include tastes and preferences, the composition or size of the population, the prices of related goods, and even expectations. A change in any one of the underlying factors that determine what quantity people are willing to buy at a given price will cause a shift in demand. Graphically, the new demand curve lies either to the right or to the left of the original demand curve. Lets look at these factors.

    Changing Tastes or Preferences

    From 1980 to 2014, the per-person consumption of chicken by Americans rose from 48 pounds per year to 85 pounds per year, and consumption of beef fell from 77 pounds per year to 54 pounds per year, according to the U.S. Department of Agriculture . Changes like these are largely due to movements in taste, which change the quantity of a good demanded at every price: that is, they shift the demand curve for that good, rightward for chicken and leftward for beef.

    Changes in the Composition of the Population

    Changes in Expectations about Future Prices or Other Factors that Affect Demand

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    How Do You Graph A Supply And Demand Curve In Excel

    The best way to graph a supply and demand curve in Microsoft Excel would be to use the XY Scatter chart. A line graph is good when trying to find out a point where both sets of data intersects. A column chart is good for displaying the variation between the data.

    To graph a supply and demand curve in Microsoft Excel in both versions 2010 and 2013, follow these steps. Replace the data used in the example below with the data that is available to you.

  • Open a new spreadsheet in Excel
  • In column A cell 1 put the word Price
  • In column A cell 2 put Qs
  • In column A cell 3 put Qd
  • In column B cell 1 put 10
  • In column B cell 2 put 200
  • In column B cell 3 put 540
  • In column C cell 1 put 20
  • In column C cell 2 put 300
  • In column C cell 3 put 480
  • Add more data as needed
  • Hover the mouse over the Insert tab in Chart group select Scatter and click the icon for Scatter with Straight lines.
  • A chart will then appear with the Supply and Demand diagram
  • To change the axis right click on the chart and click Select Data from the menu
  • Make sure to highlight the first row, which is Qs
  • Delete the data in the box that pops up for Series X and Series Y values
  • Put the cursor in the Y value box and select the Price values
  • Put the cursor in X values and highlight Qs
  • Follow the steps to edit the data for Qd column this time
  • Algebra Of Marginal Revenue

    ;Jodi Beggs

    Because marginal revenue is the derivative of total revenue, we can construct the marginal revenue curve by calculating total revenue as a function of quantity and then taking the derivative. To calculate total revenue, we start by solving the demand curve for price rather than quantity and then plugging that into the total revenue formula, as done in this example.

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    Plotting Price And Quantity Supply

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    Creating A Demand Curve

    How to Draw a Supply and Demand Graph

    After you organize the data on a demand schedule, you plot it on a graph to visualize the data trends. You can use your spreadsheet software to turn the chart into a graph, or you can sketch out a graph on graph paper. Plot each point on your demand schedule accordingly and draw an approximate line through the points.

    Note that although the independent variable typically goes on the x-axis on a graph and the dependent variable goes on the y-axis, the convention for demand curves is to put price on the y-axis and quantity demanded on the x-axis. If using a software program to generate the graph, be aware that it may plot your data the opposite way. Pay attention to the labels and axes.

    Textbooks may show the demand curve as a straight line, but this rarely happens in real-life applications. Instead, as Khan Academy explains, demand curves typically look, well, curved. The slope can be relatively flat or steep. However, they always have a downward slope due to the law of demand.

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    Exceptions To The Demand Curve

    There are some exceptions to rules that apply to the relationship that exists between prices of goods and demand. One of these exceptions is a Giffen good. This is one that is considered a staple food, like bread or rice, for which there is no viable substitute. In short, the demand will increase for a Giffen good when the price increases, and it will fall when the prices drops. The demand for these goods are on an upward-slope, which goes against the laws of demand. Therefore, the typical response wont exist for Giffen goods, and the price rise will continue to push demand.;

    Slope Of Demand Curve


    The law of demand states that, all else being equal, the quantity demanded of an item decreases as the price increases, and vice versa. The all else being equal part is important here. It means that individuals incomes, the prices of related goods, tastes, and so on are all held constant with only the price changing.

    The vast majority of goods and services obey the law of demand, if for no other reason than fewer people are able to purchase an item when it becomes more expensive. Graphically, this means that the demand curve has a negative slope, meaning it slopes down and to the right. The demand curve doesnt have to be a straight line, but its usually drawn that way for simplicity.

    Giffen goods are notable exceptions to the law of demand. They exhibit;demand curves that slope upward rather than downward, but they don’t occur very often.

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    How To Draw Or Plot A Demand Curve On A Graph

    When a president or prime minister talks about easing of monetary policy or fiscal expansion to stimulate the economy, they are talking about changes to the aggregate demand curve. Aggregate demand is the sum of individual demand curves of all buyers inside and outside of a country.An individual demand curve represents the quantity of a commodity that a consumer is willing to buybased on price in graph form. For normal, daily goods, there is an inverse or negative relationship between the desired quantity and the price. In other words, consumers buy more commodities at lower prices than at higher prices. This microeconomic relationship is known as the law of demand.

    In this oneHOWTO article we’ll show you how to draw or plot a demand curve on a graph so that you can understand the concept better, and perhaps apply it to your own business.

    The first step to draw or plot a demand curve on a graph is to start with the basic grid. This means you have to create a table with two columns, one for price and one for quantity.

    This kind of demand curve on a graph works for a single, daily commodity. In this example, we’ll be talking about cheeseburgers.

    Once you have the grid for the demand curve on a graph, fill in the columns or axes with the amount of product that is available to be bought at different prices.

    Enter the desired quantity at the first price with a dot on the graph. Start from the top of the demand curve.

    Factors Affecting Individual Demand

    How to Draw a Demand Curve – Fundamental Economics
    • Changes in the prices of related goods
    • Changes in disposable income, the magnitude of the shift also being related to the income elasticity of demand.
    • Changes in tastes and preferences. Tastes and preferences are assumed to be fixed in the short-run. This assumption of fixed preferences is a necessary condition for aggregation of individual demand curves to derive market demand.
    • Changes in expectations.:61â62

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    Using Supply And Demand To Set Price And Quantity

    So, if suppliers want to sell at high prices, and consumers want to buy at low prices, how do you set the price you charge for your product or service? And how do you know how much of it to make available?

    Let’s go back to our gas example. If oil companies try to sell their gas at $2.15 per liter, would it sell well? Probably not. If they lower the price to $1.20 per liter, they’ll sell more as consumers will be happy. But will they make enough profit? And will there be enough supply to meet the higher demand by consumers? No, and no again.

    To determine the price and quantity of goods in the market, we need to find the price point where consumer demand equals the amount that suppliers are willing to supply. This is called the market “equilibrium.” The central idea of a free market is that prices and quantities tend to move naturally toward equilibrium, and this keeps the market stable.

    What Is The Market Demand Curve

    Economists and marketers use the market demand schedule to help set prices, determine how much of a given product to put on the market and make other decisions about supply and sales. The market demand schedule is a table that shows the relationship between price and demand for a given good.

    To make it easier to see the relationship, many economists plot the market demand schedule into a graph, called the market demand curve. Generally speaking, the market demand curve is a downward slope; that is, as price increases, demand decreases. The reverse of this is also true; as price decreases, demand increases. The job of someone providing a product is to find the sweet spot on the demand curve: the point at which price and demand are both optimal. The market demand curve can be used to find this point.

    Supply also has an effect on a products price and market demand. When supply is short, price is driven up and demand generally increases. When supply is abundant, price comes down and demand decreases. The supply of a product can also have an effect on other, competing products; for example, if corn supply is abundant, the demand for sugar may go down as corn syrup becomes a more cost-effective replacement.

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