Before we discuss how does the economy work, let us explore the concept in a detailed manner. The economy is an interrelated system of human labour. Production, exchange, and consumption of goods are fundamental tenets of an economy. In simple terms, aggregated human actions create an economy.
To improve our standard of living, we trade goods and products nationally and globally. And when labour is much more productive, the standard of living keeps on improving. Consequently, productivity is driven by working capital, specialisation, and technological innovation. And by means of increased productivity, an economy can grow in a sustainable manner.
Regional boundaries distinguish the economy of a country from one another. For instance, the Chinese economy, the German economy, the south Asian economy etc. However, with the rise of globalisation, the distinction has become more subtle. To mould an economy in a planned way, government effort and intervention is necessary.
Let us now explore different levels of the economy and its complexity.

Local Economy
When we talk about the local economy, we refer to the interconnected network of markets. And the markets are situated within a particular community. Local people, organisations and businesses contribute to this network of the economy. Moreover, the local government plays an important role as well.
To purchase raw materials, most local businesses prefer local sellers that are nearby. To motivate and increase sales, local councils or governments sometimes provide tax exemptions. In addition, sellers and buyers of products receive other benefits and incentives from the local government. The purpose is to increase production, sales, and consumption of products to keep the economy flowing and prosperous.
Consequently, within the local community, residents work for businesses and pay taxes to the local government. Local residents also pay for and consume local goods and services. Establishing a local economy was monumental to developing civilisations. Up until the 19th century, production, and exchange of goods happened within a local community.
Over time, countries around the world become more connected. And the economy expanded to become more complex. As such, local economies no longer exist as separate entities. In fact, it is a part of something bigger.
National Economy
As per the Bank of England, the national economy refers to a system for distributing scarce resources. An economy is based on resources. Workers, land, raw materials etc., are some of the resources our economy is based on. While the resources are scarce, the demand for resources is infinite.
The government moulds and manufactures an economy. Sometimes, the national government has radically different approaches to mould the economy. However, distributing scarce resources is at the heart of the economy.
And it is also the principle of the economy. Hence, we can see the principle of economy varies from one nation to another. For instance, the economy of China is very much different from the economy of the US.
Consequently, the national economies are part of a much wider network of interconnected nations.
Global Economy
The global economy is also known as the world economy. It refers to the economic system of the whole world. The global economy basically captures the various economic systems within different nations. Moreover, it also includes the exchanges and activities taking place in and out of the nations.
International trade, investment, and finance help to power the world economy. And the power of globalisation made it possible. Consequently, the broad scope can capture consumption and production of goods as well as the exchange of assets.