Definition of Economics

Economics :

Economics is the study of the production and consumption of goods and the transfer of wealth to produce and obtain those goods. Economics explains how people interact within markets to get what they want or accomplish certain goals.
Economics is often referred to as "the dismal science.


Types of Economics :

There are two main types of economics:
1.Macroeconomics .
2.Microeconomics.

Microeconomics :

Microeconomics focuses on the actions of individuals and industries, like the dynamics between buyers and sellers, borrowers and lenders.

Macroeconomics :

Macroeconomics, on the other hand, takes a much broader view by analyzing the economic activity of an entire country or the international marketplace.

Economist:

People who study economics are called economists. Economists seek to answer important questions about how people, industries, and countries can maximize their productivity, create wealth, and maintain financial stability. Because the study of economics encompasses many factors that interact in complex ways, economists have different theories as to how people and governments should behave within markets.

Father of Economics :

Adam Smith, known as the Father of Economics, established the first modern economic theory, called the Classical School, in 1776. Smith believed that people who acted in their own self-interest produced goods and wealth that benefited all of society. He believed that governments should not restrict or interfere in markets because they could regulate themselves and, thereby, produce wealth at maximum efficiency. Classical theory forms the basis of capitalism and is still prominent today.

A more recent economic theory, the Keynesian School, describes how governments can act within capitalistic economies to promote economic stability. It calls for reduced taxes and increased government spending when the economy becomes stagnant, and increased taxes and reduced spending when the economy becomes overly active. This theory strongly influences U.S. economic policy today.

Income Elesticity of Demand



Meaning:
The Income Elasticity of Demand measures the rate of response of quantity demand due to a raise (or lowering) in a consumers income. The formula for the Income Elasticity of Demand (IEoD) is given by:


IEoD = (% Change in Quantity Demanded)/(% Change in Income)





Numerical calculation of income elasticity
Now let us consider the data given below and calculate the income elasticity of demand.
Income of the consumer =Rs.5000/- Increased income =Rs.6000/- Original demand for butter = 2 Kg Increased demand for butter =2.50 Kg
From the data we get,
∆q =0.50
∆y =1000
y =5000
q =2



Substituting these values in the formula for income elasticity we get,
Ey =(∆q/∆y)(y/q)
=(0.50/1000)(5000/2)
=5/4
=1.25
Normal Good: A normal good exists if an increase in income causes an increase in demand. This is seen as a positive value for the income elasticity of demand, or a coefficient of elasticity of N > 0.

Inferior Good: An inferior good exists if an increase in income causes a decrease in demand. This is seen as a negative value for the income elasticity of demand, or a coefficient of elasticity of N < 0.
A normal good can also be classified as either elastic or inelastic, depending on the value of the income elasticity relative to 1. An inelastic normal good has a positive coefficient that is less than 1, 0 < N < 1. In contrast, an elastic normal good has a positive coefficient that is greater than 1, N > 1. This last case is commonly termed a luxury or superior good.

Superior Good: A superior good exists if a relatively small increase in income causes a relatively large increase in demand. This is seen as a positive value for the income elasticity of demand greater than 1, or a coefficient of elasticity of N > 1.

Types of Elasticity:

    A Beginner's Guide to Price Elasticity
    Price Elasticity of Demand
    Price Elasticity of Supply