Hi Frank. Thanks for joining in!
This is a somewhat big question, but I will make some observations which I hope will provoke further thoughts:
We are all aware of the difference between our needs and our wants, even if we are pretty vague about what our needs actually are. We tend to be pretty precise about what we want though! :-)
Every smoker in the world knows they want a cigarette, but very few now believe that they need one (although it is not that long since that distinction was not generally made).
Likewise, plenty of people know they are overweight because they eat too much, but they can't control their desire for food.
Information changes our ideas of what our needs are. So smokers know they don't need a cigarette, because they know nicotine is addictive and that smoking will probably make them ill if they keep doing it.
Maslow said there is a hierarchy of needs, with basic stuff near the bottom and more subtle things higher up. He had something called "self-actualization" at the top, but what this means clearly depends on what "the self" is. I don't think he had a lot to say about that (although I do not profess to be expert on his work).
If people are starving, it is easy for anyone to understand what they need, as well as what they want. Before the Second World War, the majority of people in Western Europe didn't have enough to eat, whereas just about everyone in the USA has had enough to eat since before the War if Independence.
Now that our standard of living has risen, it gets harder to identify what our needs are. This difficulty obviously means that measurements of our standard of living are extremely hard to do meaningfully. I must confess that it baffles me that anyone seriously believes that Gross Domestic Product (GDP) is a useful measure, given that it can easily be seen to rise as a result of degradation of the environment.
For instance, if my car gets vandalised, the processing of the insurance claim and the repair of the car cause money to circulate which would otherwise not have done so, so GDP goes up. If I were to divorce my wife, sell the house and borrow money to buy another one, this would be measured as an increase in GDP too.
The fact that conventional economics just chooses to ignore this is downright weird.
It seems to me that we need to study what real wealth is before we can claim to be measuring anything useful. But most economists just don't want to think about it.
In order to understand wealth, we need to examine the question of the distinction between needs and wants. In order to do that, we have to look at our models of who we are. I think this study needs a new name, since it currently doesn't exist, except scattered across dozens of different existing disciplines.
Maybe it ought to be called Eudemonics - the study of well-being?