In the context of supply and demand discussions, demand refers to the quantity of a good that is desired by buyers. An important distinction to make is the difference between demand and the quantitiy demanded. The quantity demanded refers to the specific amount of that product that buyers are willing to buy at a given price. This relationship between price and the quantity of product demanded at that price is defined as the demand relationship.
Supply is defined as the total quantity of a product or service that the marketplace can offer. The quantity supplied is the amount of a product/service that suppliers are willing to supply at a given price. This relationship between price and the ammount of a good/service supplied is known as the supply relationship.
When thinking about demand and supply together, the supply relationship and demand relationship basically mirror eachother at equilibrium. At equilibrium, the quantity supplied and quantity demanded intersect and are equal.
In the diagram below, supply is illustrated by the upward sloping blue line and demand is illustrated by the downward sloping green line. At a price of P* and a quantity of Q*, the quantity demanded and the supply demanded intersect at the Equilibirum Price. At equilibrium price, suppliers are selling all the goods that they have produced and consumers are getting all the goods that they are demanding. This is the optimal economic condition, where both consumers and producers of goods and services are satisfied.
Very simply, the law of demand states that if all other factors remain constant, if a good's price is higher, fewer people will demand it. As the price of that good goes down, the quantity of that good that the market will demand will increase. In the diagram below, you see this relationship. At price P1, the quanity of that good demanded is Q1. If the price of this good were to be decreased to P2, the quantity of that good demanded would increase to Q2. The same is true for P3 and Q3. When prices move up or down (assuming all else is constant), the quantity demanded will move up or down the demand curve and define the new quantity demanded.
After understanding the law of demand, the law of supply is simple, it's effectively the inverse of the law of demand. The law of supply states that as the price rises for a given product/service, suppliers are willing to supply more. Selling more goods/services at a higher price means more revenue. In the diagram below, you can see that as the price shifts from P1 to P2, the quantity supplied of that good shifts from Q1 to Q2. The movement in price (up or down) causes movement along the supply curve and the quantity demanded will change accordingly.
Think about it as a graphical way to represent the law of demand. Its relative slope (slanted down to the right) is because of a negative relationship between the market price of a good/service and the quantity that consumers are willing and able to buy—the higher the price, the less that will be demanded and vice-versa.
Depends on some more details from the scenario but you'd most likely see an increase in demand also known as a shift of the demand curve (to the right). This shift is happening because the price of a complement product has gone down. Think about it as people have more money to spend on a car because they have to spend less on gas. Does that help?
Well assuming that they are substitute products (because people generally choose one or the other to watch HD movies) you'd see an increase in demand for the blue ray player. Basically consumers have fewer options to watch HD movies so more are going to turn to the blue ray player. As a result, you’d see an increase in price for the Sony players (less options people would be willing to pay more). If I understand the question right there is no impact on HD DVD because they have already stopped being produced.
Think about it this way... If you have 12 cans of soda pop would you rather sell them for 1 dollar or 50 cents a can? No brainer $1.
Now consider the work it take for you to buy the soda in bulk and carry around a cooler to sell them. Would you want to carry around that cooler all day for a small profit at 50 cents a can? Maybe but consider if you could sell the cans for $5 dollars a can. You'd be much more likely to do the work associated with sell pop.
Thus producers are likely to WANT to increase the amount of product they make when the price increases (although the market might not support that new quantity).
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