David Moss at Harvard Business School, for instance, found that the rate of American bank failures was highly correlated with the level of inequality.

ECONOMIST: Less inequality does not need to mean less efficiency

The same applies to inequality at the world level.

ECONOMIST: Letters

That the level of inequality before Thatcher was correct and therefore a rise is a bad thing, and also on what I consider to be measurement errors in that inequality that does exist.

FORBES: The Economic Legacy Of Margaret Thatcher