Because of this, the quantity of a good supplied has a direct relationship to the price suppliers can demand. The more consumers are willing to pay, the more. The influence of demand and supply on real product and economic growth is the This method allows consistent estimation of the relationships among the. Even though the concepts of SUPPLY and DEMAND are On a graph, an inverse relationship is represented by a downward sloping line from left to right. As social scientists, economists try to explain human behavior.

If we assume there are quantities and prices in-between those on the schedule we get a supply curve. Law of Supply The law of supply states that there is a direct relationship between price and quantity supplied. In other words, when the price increases the quantity supplied also increases. This is represented by an upward sloping line from left to right.

Why is the law of supply true? Why is the supply curve upward sloping? Why will businesses supply more pizzas only id the price is higher? I think it is just common sense. If you want the pizza places to work harder and longer and produce more pizzas, you have to pay them more, per pizza.

But economists, as social science, want to explain common sense. We know businesses behave this way, but why? There are two explanations for the law of supply and both have to do with increasing costs. Businesses require a higher price per pizza to produce more pizzas because they have higher costs per pizza.

First, there are increasing costs because of the law of increasing costs. In a previous lecture we explained that the production possibilities curve is concave to the origin because of the law of increasing costs.

Let's say a pizza place is just opening. The owner figures that they will need five employees. After putting an ad in the paper there are twenty applicants.

### Supply and Demand

Five have had experience working in a pizza place before. They came to the interview clean and on time. The other fifteen had no work experience. A few were caught steeling pepperoni on the way out.

One spilled flour all over the floor. Which applicants will be hired? Of course it will be the five with experience and the other fifteen will be rejected because they would be too costly to hire. NOW, if the pizza place wants to produce more pizzas they will need more workers. This means they will have to hire some of those who were rejected because they were more costly less experienced, etc.

So, they will only hire the more costly employees if they can get a higher price to cover the higher costs. You come across a lemonade stand and gulp down a glass.

**Gas laws Direct and Indirect Relationships**

It tasted great so you want another. This second glass is marginal utility. But now you reach for a third glass. Suddenly your stomach is bloated and your feeling sick. That's diminishing marginal utility! There are two types of changes in demand: Changes in demand - change in the demand for a product that occurs when price drops.

Changes in the Quantity Demanded - change in the amount of a product demanded regardless of price. The difference is subtle but important. If the demand of ice cream goes up in the summer it is because consumers demand has truly increased, clearly it is hot.

In the case the business can most likely raise prices without suffering a drop in sales. This is a change in quantity demanded.

If sales of ice cream were to increase in January as a result of a price cut, however, the information we would be receiving is that the demand was artificially manipulated.

It really tells us that actual demand is low and that extra efforts had to be made to increase sales. This is change in demand. See that by plotting each of the paired observation points I through N, and then connecting them with a line or curve, we have a downward sloping line from upper left of the plane to the lower right, a negative or inverse relationship.

We have now illustrated that as price declines, the number of T-shirts demanded or sought increases. Or, we could say reading from the bottom, as the price of T-shirts increases, the quantity demanded decreases. We have stated here, and illustrated graphically, the Law of Demand in economics. Now we can turn to the Law of Supply. The positive relationship of supply is aptly illustrated in the table and graph of Figure 7. Note from the first two columns of the table that as the price of shoes increases, shoe producers are prepared to provide more and more goods to this market.

The converse also applies, as the price that consumers are willing to pay for a pair of shoes declines, the less interested are shoe producers in providing shoes to this market. The x,y points are specified as A through to E. When the five points are transferred to the graph, we have a curve that slopes from the lower left of the plane to the upper right.

### supply and demand | Definition, Example, & Graph | webob.info

We have illustrated that supply involves a positive relationship between price and quantity supplied, and we have elaborated the Law of Supply. Now, you should have a good grasp of the fundamental graphing operations necessary to understand the basics of microeconomics, and certain topics in macroeconomics. Many other macroeconomics variables can be expressed in graph form such as the price level and real GDP demanded, average wage rates and real GDP, inflation rates and real GDP, and the price of oil and the demand for, or supply of, the product.

Don't worry if at first you don't understand a graph when you look at it in your text; some involve more complicated relationships. You will understand a relationship more fully when you study the tabular data that often accompanies the graph as shown in Figures 5 and 7or the material in which the author elaborates on the variables and relationships being studied.

## Supply and demand

Gentle Slopes When you have been out running or jogging, have you ever tried, at your starting pace, to run up a steep hill? If so, you will have a good intuitive grasp of the meaning of a slope of a line. You probably noticed your lungs starting to work much harder to provide you with extra oxygen for the blood. If you stopped to take your pulse, you would have found that your heart is pumping blood far faster through the body, probably at least twice as fast as your regular, resting rate.

The greater the steepness of the slope, the greater the sensitivity and reaction of your body's heart and lungs to the extra work. Slope has a lot to do with the sensitivity of variables to each other, since slope measures the response of one variable when there is a change in the other.

The slope of a line is measured by units of rise on the vertical y-axis over units of run on the horizontal x-axis. A typical slope calculation is needed if you want to measure the reaction of consumers or producers to a change in the price of a product. For example, let's look at what happens in Figure 7 when we move from points E to D, and then from points B to A. The run or horizontal movement is 80, calculated from the difference between and 80, which is Let's look at the change between B and A.

The vertical difference is again 20 - 80while the horizontal difference is 80 - We can generalize to say that where the curve is a straight line, the slope will be a constant at all points on the curve.

Figure 8 shows that where right-angled triangles are drawn to the curve, the slopes are all constant, and positive.

Now, let's take a look at Figure 9, which shows the curve of a negative relationship. All slopes in a negative relationship have a negative value. We can generalize to say that for negative relationships, increases in one variable are associated with decreases in the other, and slope calculations will, therefore, be of a negative value.

A final word on non-linear slopes. Not all positive nor negative curves are straight lines, and some curves are parabolic, that is, they take the shape of a U or an inverted U, as is demonstrated in Figure 10, shown below.

To the left of point C, called the maxima, slopes are positive, and, to the right of point C, they are negative. You can determine the slope of a parabola by drawing a tangent touches at a single point line to any point on the curve. You can see below that a point such as R is then selected on the line, and a right angled triangle can be constructed which joins points R and B.

We can then calculate the rise over the run between points B and R from the distance of the height and the base of the triangle. So, we can generalize to say that the slopes of a non-linear line are not constant like a straight line and will vary in sign and in value. You will find that a knowledge of slope calculations enhances your understanding of the dynamics of graphs. It will likely improve your marks in economics, since many test questions require you to illustrate your thinking with graphs.