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# 经济代写|宏观经济学代考Macroeconomics代写|ECON2022 A Numerical Example

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## 经济代写|宏观经济学代考Macroeconomics代写|A Numerical Example

Changes in market equilibrium can also be examined by using a simple algebraic model. For example, consider the (hypothetical) wholesale market for potatoes in Atlantic Canada in 2019. The price is the dollar price per crate and the quantity is the number of crates (in thousands). The demand and supply curves are:
$$\begin{array}{lll} Q^D & = & 100-3 p \ Q^S & = & 20+2 p \end{array}$$
Notice that the many things shifting the demand curve (such as income, tastes, etc.) are not explicitly shown in the demand equation. Instead, their effect is already represented in the constant term of 100 . The demand equation shows that for every $\$ 1$increase in the price, quantity demanded falls by three (thousand) crates per year. Similarly, the many things shifting the supply curve are not shown explicitly, but their effect is shown inside the constant term of 20. From the supply equation it is clear that each$\$1$ increase in the price leads to an increase in quantity supplied of two (thousand) crates per year.

In order to determine the market equilibrium, we need to find the single price at which $Q^D=Q^S$. By setting $Q^D=Q^S$, we get:
$$100-3 p=20+2 p$$
which can be rewritten to get:
\begin{aligned} 80 & =5 p \ \Rightarrow p & =16 \end{aligned}

## 经济代写|宏观经济学代考Macroeconomics代写|Relative Prices

The theory we have developed explains how individual prices are determined by the forces of demand and supply. To facilitate matters, we have made ceteris paribus assumptions. Specifically, we have assumed the constancy of all prices except the one we are studying. This assumption forces us to make the distinction between absolute prices and relative prices.

The price of a product is the amount of money that must be spent to acquire one unit of that product. This is called the absolute price $₫$ or money price. A relative price $\Phi$ is the ratio of two absolute prices; it expresses the price of one good in terms of (relative to) another.

We have been reminded several times that what matters for demand and supply is the price of the product in question relative to the prices of other products; that is, what matters is the relative price. For example, if the price of carrots rises while the prices of other vegetables are constant, we expect consumers to reduce their quantity demanded of carrots as they substitute toward the consumption of other vegetables. In this case, the relative price of carrots has increased. But if the prices of carrots and all other vegetables are rising at the same rate, the relative price of carrots is constant. In this case we expect no substitution to take place between carrots and other vegetables.

The same thing is true on the supply side of the market. If the price of carrots increases while all other prices are constant, we expect producers to grow and supply more carrots because it is more profitable to do so. In contrast, if all prices increased together, relative prices would be unchanged and we would expect no particular change in the quantity of carrots supplied.

# 宏观经济学代写

## 经济代写|宏观经济学代考Macroeconomics代写|A Numerical Example

$$Q^D=100-3 p Q^S=20+2 p$$

$$100-3 p=20+2 p$$

$$80=5 p \Rightarrow p \quad=16$$

## 经济代写|宏观经济学代考Macroeconomics代写|Relative Prices

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。