There is no simple way to explain how economy works. Economy depends on various factors. The economy of the USA is not same as the economy of India. Globalization is real but still different countries have different economy even today. Argentina once faced a huge economic crisis, and in time to time, there were global economy crisis. Productivity, transactions, demands decide the economy. There are multiple theories of how the economy work. Economy is the most important aspect of modern civilization. Nothing can be done without a strong economy. Common citizens do not care to know how the economy works, as most believe that only politicians have to worry about country's economy. It is true that politicians have the power to decide certain factors, but common citizens decide in which way the country's economy will go.
Economy is not just a subject; it is good for every common citizen to understand how the economy actually works.