> Unfortunately, this economic model has been proven to be wrong.

As I've mentioned several times now, the growth of the wealthy in the 19th century corresponded with the movement of the poor into the middle class.

> If it were true, then we would have seen a decreasing gap between the rich and the poor.

What matters is the state of the poor, not the gap between rich and poor. Musk's wealth, for example, has no effect on my standard of living. Or yours.