The romantic relationship between demand and price

The marriage between demand and price: regulations of demand is a general relationship between price and utilization: when the price tag on a good goes up, the product quality demanded will land. The grade of the good demanded per time period will show up as price rises and will go up as price falls, other things being equal. There are two reasons for this law: First of all, people will feel poorer, the purchasing electricity. That is called the income aftereffect of a price rise. And the next, the nice will now be dearer in accordance with other goods. That is called the substitution effect of a price rise. Similarly, when the price tag on a good falls, the quantity demanded will grow. For example, if the price of coffe goes up, we will most likely drink much more tea, cocoa, fruit drinks Demand curve is a graph showing the partnership between this price of any good and the number of the nice demand over a given time period. Price is assessed on the vertical axis; volume demanded is measured on the horizontal axis. The demand curve show that the lower the price of a product the more volume other determinants will be demanded: Firstly, price is not the only factor that can determine how much of the nice people will buy, Demand is also influenced by the following: tastes, the number and price of alternative goods, the number and price of complementary goods, income, circulation of income, targets of future price changes. Movements along and shifts in the demand curve. A demand curve is produced on the assumption that 'other thing remains equivalent'. One of these other determinants will change, triggers demand to rise, the whole curve will change to the right, this shows that at each price.


Demand is very important for learning to be a successful entrepreneur. Because we must know what determinants effects customers to buy good. And then we can choose the right way to market goods. The demand and price, we will learn about the law of the demand and two known reasons for it. First is Income impact, second is Substitution result. Second, the demand curve will be show by way of a graph. It is the relationship between your price of the good and the number of the nice demand over confirmed time frame. Third, other determinants of demand have 6 factors: preferences, the quantity and price of alternative goods, the amount of complementary goods, income, distribution of income, objectives of future price changes. They determine how much of the good people will buy. Forth, motions along and shifts in the demand curve.

The marriage between demand and price Top of Form

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The market demand identified amount of goods or services that consumers will buy at various different prices in a specific time. In conditions, the other factors do not change.

The ingestion of something often depends upon factors, such as its main rates, income, hobbies and interests or tastes of consumers, the prices of goods and the size of intake market, the costs expected in future of products.

The quantity of demand

The quantity of the nice or service is the total amount that customer intend to buy during a particular time frame, and at a specific price.

The legislations of demand

When we presented the concept of demand of products, we just review the relationship between price and intake. This relationship is known as regulations of demand, when the price of goods rise, the quantity demand will decrease. If the price of goods decreased, the quantity demand will go up.

For example

Description the amount of VCD was sold in the city for annually.

Price Demand A Demand B Total market demand


50 0 2 7000

40 3 6 14000

30 5 8 21000

20 7 10 28000

10 9 14 35000

In table, the price tag on VCD is plotted on the vertical axis; the number demand is plotted on the horizontal axis, we have the market demand curve of VCD for yearly. The curve usually is sliding, because the numbers of price and amount demanded have contrary romance. (Economic university's publication )

The higher price of an good, the smaller is the number demanded; and the low price of an good, the larger is the quantity demanded.

There are two reasons for the law of demand:

The income effect

The aftereffect of a change in price on variety demanded arising from the consumer becoming better or worse off because of this of the purchase price change. ( John Sloman)

When the incomes of consumers grow, they will be prepared to pay more for buying goods and services. Often they can buy more goods and services with higher price and quality than before. For the consumers have low income, they'll not be able to buy so many products using their money. That is called the income effect of a price.

For example: iPhone in real Vietnamese market, for the people, who have an increased income. If they need it a product, that they like they will be willing to buy it with every level of price. An average day about 6 guests in question and two different people end up buying this product. Despite the high price is "excessively". However the company do not provide these goods to any buyer. But also for the people, who've lower income. They do not can pay for to buy iPhone. They'll choice to hold back unstill the price is cut down.

The substitution effect

A substitution is a good you can use instead of another good. (John Sloman)

When the price of a product go up, the number demanded will land. People do not need to buy more, and they will switch from consuming substitute goods.

For example: In Vietnam, Viettel and VN mobiphone are selling the iPhone with a 2 or 3 3 years agreement. They have two kind of iPhone: the new some may be Iphone 4 4 and the old an example may be apple iphone, so for the knowledgeable about iPhone products, they will chose to buy the iPhone 3GS with the 3 years contract because the price of this lines is cheaper the deal of Iphone 4 4 with agreement. ( in Vietnamese magazine).

The Demand Curve

In economic, a demand curve is a graphical or numerical diagram that presents the relationship between your price and quantity of a product that consumers are ready to buy. This romantic relationship is inverse of each other because most of us know if the purchase price gets higher, people want less of a particular product. This inverse romance is nearly always can within any of trials and calculating the resource and demand of certain products of some companies in a competitive market. They pull this graphical over time because the demand curve help the firms in determining if the certain product is really profitable at the pricing point on the curve where it is popular. On a regular basis in a normal graphical, the demand curve interacts with a resource curve on the creation possibility, depicting the relationship between market supply and market demand. When demand curve and offer curve cross, the marketplace price is said to be at equilibrium. (Robert Schenk n. d. )

To sketch a graphical of the demand curve, beginning with two perpendicular lines building a right position. The vertical range or we called the y-axis signifies "price"; and the horizontal series or we called the x-axis presents the "quantity demanded". Price increments progress along the exterior of the y-axis with the best price nearest the most notable. Number increments move from remaining to right just below the x-axis series with the lowest physique nearest to the 90 point of the perspective. The demand curve normally slopes downward from still left to right. In doing this, the demand curve demonstrates incremental changes of higher variety demanded at lower prices. Economists often utilize the demand curve to calculate and job the demand and charges for capital goods, services, labor, as well as many other economic factors.

There are so many ways to express the partnership between price and the quantity that individuals will buy. In the mathematically, we can say that quantity demanded is a function of price. In another way, one more easily and primary way to fully capture the partnership is by means of a desk. The numbers in the form of desk are what one expects in a demand curve: as price rises, the amount people are willing to buy decreases. For example, we will have this happen on the main one of the favorite product on the planet that is iPhone form the Apple Company. So we consider that people have 100 of individuals want to buy this iphone. At the start apple sell this proficient at 1000 us dollars so everybody think the purchase price continues to be so expensive, so only 40 peoples payed for this price to buy it. But from then on apple reduced this price to 800 us buck so there have 70 individuals to buy this good. After that apple sells the product only 400 us money and now all of them accepted to pay this price. So we may easily to see there will have more high quantity demanded if the product at the lower prices. You will find more folks want to pay for a good product at a cheap prices.

A Demand Curve

Price of


Number of iPhone

People Want to Buy









The same information can also be plotted over a graph, where it'll look like the graph below.

For example: iPhone in the real Vietnamese market, according to those proficient in Apple products, for the personal who've high income, they'll be willing to spend more $2000 because of this property and equipment soon best thing in 2010 is unsurprising. But until now the price of new iphone 4 is reducing a lot, just only around $1000, so many people come to the store everyday for requesting and already can spend money because of this price. Many store at Vietnam said that they don't have sufficient this good to sell out. ( in Vietnamese newspapers )

Determinants of Demand

The determinants of demand are factors that impact to the increase or decrease of demand of goods. It is also known as demand shifters.

1. ) Likes or personal preferences of consumers: the tastes are certain subconscious reasons for liking or disliking a particular good. If the taste of your good is higher, the demand of the good will rises. On the other hand, a decrease in taste of the good will reduce its demand. Corresponding to essentials of economics booklet, the tastes of products are affected by advertising, by fashion, by observing other consumers, by concerns of health insurance and by the experiences from consuming the good on previous occasions. For instance, the demand of red wine increase when it show reported that sipping red wine every day will lowers cholesterol and decreases the chance of coronary attack.

The romantic relationship between flavour of consumers and demand of goods

When the preferences of something increase, the good's demand can also increase.

When the likes of a product cut down, the good's demand also decrease.

2. ) Quantity of consumers on the market: If the consumers increase, the demand of product is can also increase. On the other hand, fewer consumers will decrease the demand of product. For instance, the demand of sweater increase when winter is approaching as a result of increasing of consumer of this good

3. ) The earnings of consumers: is one of the factors that have an effect on the demand for a given product. The products that people will buy more when their income climb is named normal goods (or superior goods). In contrast, the goods that folks are less inclined to buy when their income surge is called substandard goods. One of these of inferior goods might be ridding the bus. When income increases, people reduce the demand of using bus and they're more likely to own a motorbike.

The relationship between the Superior goods and the income of consumers:

· When the income of consumers rises, an excellent good's demand also increases

· When the income of consumers reduces, an excellent good's demand also decreases

The relationship between the Poor Goods and the income of consumers

· When the income of consumers rises, an inferior good's demand also decreases

· When the income of consumers reduces, an inferior good's demand also increases

4. ) The quantity and price of complementary goods: the supplement goods are those that are consumed as well as one you want to buy such as autos and petrol, shoes and polish, or home and furniture. What happen with the demand of autos if the price tag on petrol increases? The answer is that it'll be fall. When the price tag on petrol rises, people are less inclined to buy autos. Therefore, the our marriage is: if the price tag on the complement rises (falls), the demand of the merchandise falls (or increases). .

5) The number and price of alternative goods: the swap goods are those which consumers change to buy more than the other goods which increase its price. For instance, the demand for Nike's goods will rely upon the price of Adidas goods. If Nike's goods go up in cost, the demand for Adidas goods will grow.

6) Consumer expectation about the near future prices changes: it's the people's thinking about the fluctuation of the price tag on the products. For instances, if the land's prices are going to rise in the foreseeable future, they will probably buy more land now before the prices do go up

Determinants of iPhone prices

How demand impact to Iphone price

iPhone prices are dependant on demand. If demand rises (i. e. move to the right), the equilibrium price of I telephone will go up or the equilibrium price of iPhone will show up if demand rises. So why will iPhone price fluctuate diversely in the world. The answer lies in changes in the demand for iPhone. Here are some examples of various factors that have an impact on the demand of iPhone.

Tastes: The preferences of iPhone are influenced by fashion and high quality of technology. First, iPhone was created modern and beautiful outdoors that attract consumers shift to buy it. Besides that, it also own one of the humble technology in mobile phones nowadays that help consumers incorporate may options in a single which is faster and far more convenient.

For Example: in any shopping website or reports website we may easily to see this good product, iPhone is the almost all of a symbol of the popular phone on earth. In another way, some games show on tv or internets possess the best award for whom get the game and that prize will be an iPhone. There are so many ways for each people on earth know about the iPhone by the marketing and that is why when one people said iPhone and any people within really know what that is. The majority of people, who like the smartphone, actually want to get one on their behalf soon and do not care it is expansive or not because they think this mobile can do more thing, not only as a standard phone.

Number and price of complementary goods: You may already know, iPhone has a whole lot of tournaments in market and the best of iPhone are HTC and BlackBerry. The demand of iPhone has decreased many times because of the advantages of new type of HTC and BlackBerry mobile phones so that business lead iPhone's price falls. Besides that, because the HTC and Blackberry mobile phone is cheaper than iPhone. So for the purchasers who wish to buy the smart phone, they have so many choice varieties other company's telephone.

Movements along and shifts in the demand curve:

A deand curve is constructed on the assumpion that 'other things remain equal.

When one of these other determinants will change? The answer is that people have to construct a complete new demand curve:the curve shifts. If a change in another of the other determainants triggers demand to rise-say, income increases- the complete curve will move to the right. This implies that at each price, more will be demanded than before.

Example:when VN have H5N1 Epidemic diseases. Everyone don't buy chicken breast meat anymore plus they change to pork. so demand of pork will rise and quantity will increase too.


Analyzing demand is a part of business planning, every company need to know about the amount of quantity to create the price climb that contend with competitor in the market. The APPLE MACKINTOSH has a lot of products which need to be examined for different market, help Apple Company understand how many products to create and set suitable prices.

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