Health: Citizens in unequal societies, researchers have shown, are more likely end up sick, obese, unhappy, unsafe, or in jail.
Race: The Great Recession deepened the longstanding racial and ethnic wealth divide in the United States. The typical white family held a net worth six times greater than the typical black family at the end of the 20th century. That gap has now doubled. The wealth gap between white and Latino households has widened as well.
Demise of economic mobility: less mobility of workers, professionals in the workforce is possible
Incentives: inequality within that labor share is widening; wage growth has flatlined for a generation
Public good, not market power & private interests: economic inequality endangers democracy: Market power will always shape political outcomes; tilts public policy toward special treatment (deregulation, tax breaks) and away from the public or collective goods (education, infrastructure) essential to future economic growth. Economic inequality breeds inequality in politics, and makes policies that make economic inequality even worse.
Inequality.org