Not to be confused with the three traditional sectors of econonomy:
1: production (e.g. food, minerals)
2: manufacturing (cars, cellphones)
3: services (banking, cleaning, security, restaurants, theaters…)
Then with the post-indstrial society we get:
4: information services (e.g. online banking, research and development)
5: human services, ‘gold collar’ professions, youtube video stars
All these sectors exist at all times, but the greater the productive efficiency of society becomes, the fewer people are technically needed at the lower levels of the economy and the less they get paid, while the higher levels get more pay because the society is able to produce wealth without employing everyone to basic productive tasks. That means everyone tries to jump one step up in the ladder: urbanization happens - but there you don't have an equitable distribution of wealth anymore because the higher you go in the ladder, the less it's about who does and who doesn't. Hard work doesn't pay, but who can bullshit themselves more money. Value becomes imaginary.