There’s a name for this approach, coined by the Belgian philosopher Ingrid Robeyns: limitarianism. Robeyns argues that there should be an upper limit to the amount of income and wealth a person can amass. Just as we recognise a poverty line, below which no one should fall, we should recognise a riches line, above which no one should rise. This call for a levelling down is perhaps the most blasphemous idea in contemporary discourse.
But her arguments are sound. Surplus money allows some people to exercise inordinate power over others: in the workplace; in politics; and above all in the capture, use and destruction of the planet’s natural wealth. If everyone is to flourish, we cannot afford the rich. Nor can we afford our own aspirations, which the culture of wealth maximisation encourages.
The grim truth is that the rich are able to live as they do only because others are poor: there is neither the physical nor ecological space for everyone to pursue private luxury. Instead we should strive for private sufficiency, public luxury. Life on Earth depends on moderation.