As I stated before, economic theory suggests that income inequality is a necessary price to pay for economic efficiency: unequal rewards incite those with talents, skill and perseverance to innovate and to be productive, so they can reap higher benefits. Ultimately, this serves the welfare of the whole of society (a process which is then caricatured in trickle down economics). The mirror image of this is reductions of inequality that take away incentives for doing well, and that therefore result in economic inefficiency and less prosperity for all.
Tyler Cowen has framed it like this:
Redistribution of wealth has some role in maintaining a stable democracy and preventing starvation. But the power of wealth redistribution to produce net value is quite limited. The power of wealth creation to produce net value is extraordinary … We should be putting our resources, including our advocacy and our intellectual resources, into wealth creation as much as we can. (source)
But is that really true? There is some evidence that reducing inequality through redistribution actually promotes wealth creation. What’s the mechanism? Sam Bowles claims to have identified one element of it:
Inequality breeds conflict, and conflict breeds wasted resources … [I]n a very unequal society, the people at the top have to spend a lot of time and energy keeping the lower classes obedient and productive. Inequality leads to an excess of what Bowles calls “guard labor”. (source)
Poverty causes credit constraints. This stops the poor investing in businesses or education; the low aspirations caused by poverty can have the same effect. … Inequality can create the threat of redistribution which can blunt incentives to invest. Or it can lead to state interventions – such as the minimum wage – that harm wealth creation. … The backlash against wealth-creating processes such as globalization, offshoring and private equity in the UK and US are founded in the view that they create inequality. If we had better redistribution mechanisms (say, a basic income) such backlashes would be reduced, and the wealth creation process enhanced. (source)
That sounds persuasive and I want to see some evidence. In the meantime, it’s perhaps a bit glib to announce that “the power of wealth redistribution to produce net value is quite limited”.