Kristalina Georgieva said new IMF research, which compares the current economy to the “roaring 1920s” that culminated in the great market crash of 1929, revealed that a similar trend was already under way.

While the inequality gap between countries had closed in the last two decades, it had increased within countries, she said, singling out the UK for particular criticism.

“In the UK, for example, the top 10% now control nearly as much wealth as the bottom 50%. This situation is mirrored across much of the OECD (Organisation for Economic Co-operation and Development), where income and wealth inequality have reached, or are near, record highs.”

She added: “In some ways, this troubling trend is reminiscent of the early part of the 20th century – when the twin forces of technology and integration led to the first gilded age, the roaring 20s, and, ultimately, financial disaster.”

She warned that fresh issues such as the climate emergency and increased trade protectionism meant the next 10 years were likely to be characterised by social unrest and financial market volatility.

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