Correlated Gauges are two gauges joined together, with one shared needle that indicates a status in two different fields that are interconnected.
This correlated gauge example can be applied to a common automobile’s internal-combustion engine. In this system, there is an ideal temperature operating range (A Goldilocks Zone) that is “Not too hot and not too cold.” If an engine is cold, it operates inefficiently. If an engine runs hot, it will fail.
Just as there is an ideal operating temperature-zone for an internal-combustion engine, so it is true for economic inequality and private/public controlled capitalism.