There are four main types of economic systems:

1. Traditional Economy: This type of economy is based on customs, traditions, and beliefs. Production and distribution of goods and services are carried out as per the traditional practices of the community. It is often found in rural and agricultural societies.

2. Command Economy: Also known as a planned or centrally planned economy, this system is controlled by the government. The government decides what goods and services are produced, how they are produced, and who will receive them. This type of economy is often associated with communist or socialist countries.

3. Market Economy: In this system, economic decisions are made by individuals and businesses based on supply and demand. Prices are determined by the free market, and there is limited government intervention. The United States is an example of a market economy.

4. Mixed Economy: This is a combination of a market economy and some government intervention. The government regulates certain industries and provides public goods and services such as healthcare and education. Most modern economies, including the United States, have mixed economies.

Each economic system has its advantages and disadvantages, and countries may lean more towards one type or have elements of multiple systems. The choice of economic system depends on factors such as the country's political ideology, resources, and cultural values.