In medicine, there are four levels of care: primary, secondary, tertiary, and quaternary. The levels of care refer to the complexity of the medical cases that healthcare providers treat and the skills ...

All industry is part of a chain that starts with primary industry: the production or extraction of raw materials, like agricultural products or mining; and secondary industry: the processing of these ...

An industry is any economic activity which creates jobs and generates income. There are four main types of industry: primary, secondary, tertiary and quaternary. The type of industry a country ...

Traditionally, industrial workplaces are defined as those where goods are manufactured, often in factories with assembly line environments. In modern economic models that break industry into five ...

Log-in to bookmark & organize content - it's free! From a film, American Harvest, that shows the wide variety of American businesses and industries that produce the materials needed to manufacture ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...