It is blatantly obvious that having 100% of the population live an above average lifestyle is impossible.And my point is a question: Why is it impossible? Give me a good reason why it is impossible. A GOOD reason.
Take the GDP of a country and divide it by that country's population. That is how averaging works. Take any number that is more than that averaged number (in other words any number that is 'above average') and multiply it by that country's population (in other words apply an above average lifestyle to 100% of the population). You will see that the number you end with is greater than the GDP, in other words the GDP is not able to support what you requested. The GDP is the total produced value of a country, therefore what this tells us is the country physically does not produce enough to sustain your request (that 100% be above average)
You will notice I did not use any example numbers of my own. That is because this applies to ANY numbers that you might plug in yourself, not just some specific time and place. It is a universal.
Now you know that it is impossible to have 100% of a population be above average. Welcome to grade school maths. If you require a second lesson let me know at any time.