Have you heard of the concept of Conglomerates?

In the US, GE makes your microwave, aircraft engines, and also the gas turbine your power plant uses.

Siemens makes appliances, MRI machines, and even nuclear reactors I believe.

Or in Korea: Samsung, Hyundai, LG. Samsung makes chips, TVs, washing machines.

Japan: Mistubishi makes washing machines and excavators and mining equipment.

India: Reliance has cell phone service, grocery stores, and oil rigs. Tata makes cars, has tier 1 datacenters, and runs hotels too.

This is hardly a novel idea.