not sure if this is meant to be snarky, but taken at face value it's right on. you want an economy to be dynamically stable, and a working middle class does just that. it provides status and meaning for a larger share of economic participants than otherwise would happen, and that equates to economic stability (while greater wealth disparity leads to greater discontent).

the US economy is currently spiraling away from that stability, as evidenced by our worsening gini coefficient over the past several decades.