In most rich countries, inequality is rising, and has been rising for some time. Many people believe this is a problem, but, equally, many think there’s not much we can do about it. After all, the argument goes, globalisation and new technology have created an economy in which those with highly valued skills or talents can earn huge rewards. Inequality inevitably rises. Attempting to reduce inequality via redistributive taxation is likely to fail because the global elite can easily hide their money in tax havens. Insofar as increased taxation does hit the rich, it will deter wealth creation, so we all end up poorer.

One strange thing about these arguments, whatever their merits, is how they stand in stark contrast to the economic orthodoxy that existed from roughly 1945 until 1980, which held that rising inequality was not inevitable, and that various government policies could reduce it. What’s more, these policies appear to have been successful. Inequality fell in most countries from the 1940s to the 1970s. The inequality we see today is largely due to changes since 1980.

In both the US and the UK, from 1980 to 2016, the share of total income going to the top 1% has more than doubled. After allowing for inflation, the earnings of the bottom 90% in the US and UK have barely risen at all over the past 25 years. More generally, 50 years ago, a US CEO earned on average about 20 times as much as the typical worker. Today, the CEO earns 354 times as much.

Any argument that rising inequality is largely inevitable in our globalised economy faces a crucial objection. Since 1980 some countries have experienced a big increase in inequality (the US and the UK); some have seen a much smaller increase (Canada, Japan, Italy), while inequality has been stable or falling in others (France, Belgium and Hungary). So rising inequality cannot be inevitable. And the extent of inequality within a country cannot be solely determined by long-run global economic forces, because, although most richer countries have been subject to broadly similar forces, the experiences of inequality have differed.

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