This could also be a story of technological progress. A thought experiment - imagine you, an archaeologist, recovered the remains of our civilization, from roughly 1925 to 2025, but the only surviving artifact was televisions. You know that televisions are valuable - initially only wealthy families had them - so you used them as a proxy for riches and plotted the Gini coefficient using just the size, quality, resolut…
House size/living space is far more constant. It would make a good and proxy for riches in a contemporary society too.