# Quantity in Math Definition, Uses & Examples Video & Lesson Transcript

Whether the item is material or labor, you need to define how it’s measured. For instance, the material would be by the gallon if it’s paint, while the painter would be measured by the hour because they’re a laborer. Now you’ll want to differentiate between the two types of items on your bill of quantities. Leading up to the summer months, it was selling 100 cars per month, earning \$2 million in revenue. The cost to make and sell each car was \$15,000, making Green’s net profit \$500,000. If a supplier provides a lower quantity, it is losing out on potential profits.

How many gallons of paint will you need to paint the exterior of the building, and how many hours will it take for the painters to do this job? Technological improvements can help boost supply, making the process more efficient. These improvements shift the supply curve to the right—increasing the amount that can be produced at a given price. Now, if technology does not improve and deteriorates over time then production can suffer, forcing the supply curve to shift left.

## Inverse Relationship of Price and Demand

Now, for a producer substitute, the producer can produce one good or another. If the price of corn increases, farmers will look to grow more corn, decreasing the supply of soybeans. Thus, an inverse relationship exists before a good’s price and the supply of the producer substitute.

• Thus, changes in production costs and input prices cause an opposite move in supply.
• A bill of quantities is an important document in construction project management.
• But you’ll want to add some context, especially since there’s likely to be paint used for a number of different things in the construction project.
• This is important because we need to understand that 4 – 2, where 4 is the quantity of area and 2 is the quantity of length is nonsense.
• There are also ratio quantities which are described by fractions or percentages.

Assuming that non-price factors are removed from the equation, a higher price results in a lower quantity demanded and a lower price results in higher quantity demanded. Thus, the price of a product and the quantity demanded for that product have an inverse relationship, as stated in the law of demand. A bill of quantities can be used for many purposes, but its main goal is to act as a list of all the materials and labor that’ll be used over the course of a construction project. This means it must capture the relevant details for these items to be useful. There are, of course, different bills of quantities, but the following is usually the common denominator among all of them. As noted above, the bill of quantities is also helpful when a project owner is looking for construction contractors.

## Why Is a Bill of Quantities Important In Construction?

With the average selling price up to \$25,000, the new net profit per month is \$1 million. Thus, raising the quantity supplied of cars will increase Green’s profits. Joint products, for example, for a company that raises steers are leather and beef. There’s a direct relationship between the price of a good and the supply of its joint product. If the price of leather goes up, ranchers raise more steer, which increases the supply of beef (leathers’ joint product). By graphing these combinations of price and quantity demanded, we can construct a demand curve connecting the three points.

There are also ratio quantities which are described by fractions or percentages. Ratio quantities like 2/5 or 10% describe how two quantities are related. If the quantity of students absent out of the total quantity of students in the class is 10%, then for every nine students in attendance, one student is absent.

## Quantities in Comparatives and Measure Phrases

The proportion to which the quantity demanded changes with respect to price is called elasticity of demand. A good or service that is highly elastic means the quantity demanded varies widely at different price points. Therefore, it’ll list wood, nails and paint, defining where these will be used and how much of each is necessary. You’ll also list all the labor involved, from cutting the wood to assembling the dog house frame and adding siding, nailing this together and painting the finished product. This is all done before the execution of the project, but after the project has been approved. The bill of quantities is then shared with the bidding construction contractors, who used the information therein to help them come up with their bids for the job.

• The quantity supplied differs from the actual amount of supply (i.e., the total supply) as price changes influence how much supply producers actually put on the market.
• Quantities are used to measure, calculate other quantities, and predict the outcomes of experiments.
• Three key factors impact the supply curve—technology, production costs, and price of other goods.
• Therefore, it’ll list wood, nails and paint, defining where these will be used and how much of each is necessary.
• As long as consumers’ preferences and other factors don’t change, the demand curve effectively remains static.

This allows the owner to understand the cost of the project and how it’ll be paid over the various phases of the project. For example, if a photographer offers family portrait sessions for a lower price, they should book more sessions. Conversely, a good or service that is inelastic is one with a quantity demanded that remains relatively static at varying price points. Regardless of price point, those who need insulin demand it at the same amount. Quantities are used everywhere outside of pure mathematics in both everyday lives and in many sciences. You use quantities when shopping, when counting, when doing calculus, and when remembering your age.

## Streamline Payroll With Secure Timesheets

This is where you first detail all the materials and labor you’ll need to execute your project. This process is critical in finding the best prices for the materials and labor you need before you’re committed to the execution of that construction project. An increase in quantity demanded is caused by a decrease in the price of the product (and vice versa). A demand curve illustrates the quantity demanded and any price offered on the market. A change in quantity demanded is represented as a movement along a demand curve. The proportion that quantity demanded changes relative to a change in price is known as the elasticity of demand and is related to the slope of the demand curve.

## Understanding Quantity Demanded

On the supply and demand graphs, quantity is in on the x-axis and demand on the y-axis. Demand and quantity demanded both pertain to purchasing but in different ways. Demand is just how many of an item a consumer is willing to buy—the sheer quantity. Quantity demanded is how many things a consumer will purchase at a specific price. Graphed out, demand is the entirety of the demand curve, whereas quantity demanded is a single point. Once you set a baseline on the Gantt chart, you can track your resources across the software.