Demographic profiling is a way of categorising the population by age/money/population/etc...
A- Higher management, bankers, lawyers, doctors, etc... (Financial Times).
B- Middle management, teachers, creative and media people such as graphic designers, etc... (Mac book advert).
C1- Office supervisors, junior managers, nurses, specialist clerical staff, white collar jobs, etc... (Radio 2).
C2- Skilled manual workers, plumbers, builders, blue collar jobs, etc... (Eastenders, the Sun).
D- Semi-skilled and unskilled manual workers, etc... (I am a celebrity get me out of here, take a break TV).
E- Unemployed, students, pensioners, casual workers, etc... (Daytime TV).