# data[].attributes.body
Primary economic activity is the extraction of raw materials from the Earth, like the mining of bauxite (aluminum-rich ore).

# data[].attributes.body
There is a lot of bauxite mining (ore rich with aluminum) in China (mainly the south) because there are so many ore deposits.

# data[].attributes.body
Based on the population pyramid, I would classify China as a Class 4, which means that it is a developed country. China is one of the world's largest manufacturers, and for that they have to have a lot of machinery and technology, which would move the country up on the DTM.

# data[].attributes.body
Secondary economic activity is the processing and assembly or manufacturing, like the refining of the bauxite and the pressing of the aluminum, along with the rolling.

# data[].attributes.body
China is one of the world's largest manufacturers, and, as such, they have lots of big factories. The aluminum foil refineries and factories would fit right in.

# data[].attributes.body
China is a developed country (Class 4), which makes sense, because with all the factories and new technology, they can apply it quickly in other aspects of life.

# data[].attributes.body
Tertiary economic activity is the service industry, including with retail services, like the seller of aluminum (wholesale and retail).

# data[].attributes.body
The US is the largest buyer (which also means retailer, only behind China itself) of aluminum foil.

# data[].attributes.body
The US is a developed country (Class 4), probably partly because it is a major player in the world economy in imports and exports.

# data[].attributes.body
Quaternary economic activity is the business of knowledge and includes research and development, like the research about the structure and health side effects of aluminum foil.

# data[].attributes.body
The US has lots of resources and research facilities, as well as a high technology level. I makes sense that a lot of the research and improvement would go on here.

# data[].attributes.body
The US is a developed country (Class 4), partly because it has such a high research and improvement capacity.