An economy (from Greek οίκος – household and νέμoμαι – manage) is an area of the production, distribution and trade, as well as consumption of goods and services by different agents. Understood in its broadest sense, The economy is defined as a social domain that emphasize the practices, discourses, and material expressions associated with the production, use, and management of resources. (Wikipedia)

There are a number of concepts associated with the economy, such as these:

Consumer spendingExchange rateGross domestic productGDP per capitaGNPStock MarketInterest rateGovernment debtRate of InflationUnemploymentBalance of Trade

The GDP (gross domestic product) of a country is a measure of the size of its economy. The most conventional economic analysis of a country relies heavily on economic indicators like the GDP and GDP per capita. While often useful, GDP only includes economic activity for which money is exchanged.

The more an economy of a country is developed the less crime take place in that country.
Many scientists believe that if the economy of a country is good then the people of that country can educate more and have a better future.

The economy in poor countries like many African ones is not in a good condition so we can see many infant mortality and many of them even do not access healthy water and food.