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I agree with Ragesh (Wikipedia) Blue - Labour class , hourly wages, White collar - Employee class (salaried), Gold Collar Doctors, Engineers, Lawyers Etc
Blue-collar
A "Blue-collar worker" is a member of the working class, who performs manual labor and earns an hourly wage.
White-collar
It means a salaried professional, typically referring to general office workers and management
Gold-collar
Highly skilled professionals who may be in high demand, such as engineers, doctors and lawyers.
Ref:
http://en.wikipedia.org/wiki/Collar_workers
Details with Subcategories
· Scarlet Collar: – Female shop workers.
· Black Collar: – Miners (especially coal miners) and oil workers.
White-collar worker: – It means a salaried professional, typically referring to general office workers and management.
Subcategories:
· Pink-collar worker – Secretarial, administrative, or other clerical workers.
· Grey-collar – A skilled Technician, typically someone who is both white and blue collar, i.e., Information Technology workers. They are principally white collar, but perform blue collar tasks with some regularity.
· Gold-collar worker – Highly skilled professionals, such as engineers, doctors and lawyers.
· Red-collar worker – Former who work under sun light. Government workers of all types. Derived from compensation received from red ink budget.
Source: http://en.wikipedia.org/wiki/Collar_workers