Is that why workers are generally happier in Europe even though on paper their economy loses?
The floor is universal: starvation, suffering, death.
The ceiling...
For someone who's starving & facing death, would simply be good health, easy access to food, healthy family, house & car.
But the ceiling for someone who already has these things is different. The ceiling for a billionaire is different.
The only way I can imagine not doing this type of subjective self-reporting is... maybe you can draw blood from populations and record cortisol and oxytocin levels?