The main source of income for Brazil is its diverse economy, which encompasses various sectors. Some of the key contributors to Brazil's income are:

1. Agriculture: Brazil is one of the largest agricultural producers in the world. It is a major exporter of commodities such as soybeans, coffee, sugar, beef, poultry, and oranges. Agriculture plays a significant role in Brazil's economy, contributing to both domestic consumption and foreign trade. For instance, Brazil is the world's largest exporter of soybeans, accounting for around 40% of global exports. It is also the largest exporter of beef and poultry.

2. Manufacturing: Brazil has a well-established manufacturing sector, which includes industries such as automotive, aerospace, machinery, textiles, and chemicals. The manufacturing industry contributes significantly to Brazil's GDP and provides employment opportunities. For example, Brazil is known for its automobile industry, with companies like Fiat, Volkswagen, and General Motors having manufacturing plants in the country.

3. Services: The services sector is a major source of income for Brazil. It includes industries such as finance, telecommunications, tourism, and retail. Brazil has a growing middle class, which has led to increased consumer spending on services such as banking, insurance, telecommunications, and retail goods. The tourism industry also plays a significant role, attracting both domestic and international visitors to destinations like Rio de Janeiro, Sao Paulo, and the Amazon rainforest.

4. Mining: Brazil is rich in mineral resources, including iron ore, bauxite, gold, and niobium. The mining industry contributes to Brazil's income through exports and domestic consumption. For instance, Brazil is one of the world's largest producers and exporters of iron ore, which is used in steel production.

5. Oil and Gas: Brazil has significant offshore oil reserves, particularly in the pre-salt layer of the Atlantic Ocean. The oil and gas industry, operated by state-owned Petrobras, generates income through domestic consumption and exports. Brazil is a net exporter of oil and gas, and the sector contributes to the country's trade balance.

It is important to note that the relative contribution of these sectors to Brazil's income may vary over time due to economic fluctuations, policy changes, and global market conditions.

References:

1. "Brazil's Agricultural Production and Exports." USDA Foreign Agricultural Service. https://www.fas.usda.gov/data/brazils-agricultural-production-and-exports

2. "Brazil - Manufacturing." Encyclopedia of the Nations. https://www.nationsencyclopedia.com/economies/Americas/Brazil-MANUFACTURING.html

3. "Brazil Services Sector Analysis." Mordor Intelligence. https://www.mordorintelligence.com/industry-reports/brazil-services-sector-analysis

4. "Brazil - Mining and Manufacturing." Encyclopedia of the Nations. https://www.nationsencyclopedia.com/economies/Americas/Brazil-MINING-AND-MANUFACTURING.html

5. "Brazil - Oil and Gas." Encyclopedia of the Nations. https://www.nationsencyclopedia.com/economies/Americas/Brazil-OIL-AND-GAS.html