I argued, in effect, that "if we want everything to stay the same, everything must change", as the Italian author Giuseppe Tomasi di Lampedusa wrote. If we want to preserve our freedom and democracy we need to embrace change. Here are five policy areas that need to be addressed.

First, competition. Thomas Philippon's wonderful book, The Great Reversal, demonstrates how far competition has weakened in the US. This is not the result of inevitable forces, but of policy choices, especially abandonment of an active competition policy.

US markets have become less competitive: concentration is high, leaders are entrenched and profit rates are excessive. Moreover, this lack of competition has hurt US consumers and workers: it has led to higher prices, lower investment and lower productivity growth.

In a paper on reducing inequalities, in an invaluable collection on Beyond Brexit: A Programme for UK Economic Reform, Russell Jones and John Llewellyn argue that concentration and mark-ups have also risen in the UK.

In the past decade, Amazon, Apple, Facebook, Google, and Microsoft combined have made over 400 acquisitions globally. Dominant companies should not be given a free hand to buy potential rivals. Such market and political power is unacceptable.

A refurbishment of competition policy should start from the assumption that mergers and acquisitions need to be properly justified.

Second, finance. One of Prof Philippon's most striking conclusions is that the unit cost of financial intermediation has not fallen in the US over 140 years, despite technological advances. This stagnation in costs has, alas, not meant financial stability.

There is also evidence that there is now simply too much credit and debt. Radical solutions exist here, too: raise the capital requirements of banking intermediaries substantially, while reducing prescriptive interventions; and, crucially, eliminate the tax-deductibility of interest, so putting debt finance on a par with equity.

Third, the corporation. The limited liability joint stock corporation was a great invention, but it is also a highly privileged entity. The narrow focus on maximising shareholder value has exacerbated the bad side-effects.

As the British Academy's Principles for Purposeful Business report argues, "the purpose of business is to solve the problems of people and planet profitably, and not profit from causing problems". That is self-evident.

It is also hopeless to rely on regulation alone to save us from the consequences of myopic business behaviour, particularly when business uses its vast resources to lobby on the other side. The US Business Roundtable has recognised this. We need new laws, to effect required changes.

Fourth, inequality. As Aristotle warned, beyond a certain point, in­equality is corrosive. It makes politics far more fractious, undermines social mobility; weakens aggregate demand and slows economic growth. Heather Boushey's Unbound spells all this out in convincing detail.

To tackle it will require a combination of policies: proactive competition policy; attacks on tax avoidance and evasion; a fairer sharing of the tax burden than in many democracies today; more spending on education, especially for the very young; and active labour market policies, combined with decent minimum wages and tax credits.

The US has poor labour force participation of prime-aged adults, despite unregulated labour markets and a minimal welfare state. It is possible to have far better outcomes.

Finally, our democracies need refurbishing. Probably, the most important concerns are over the role of money in politics and the way the media works. Money buys politicians. This is plutocracy, not democracy.

The malign impact of fake news (which is the opposite of what the US president means by the term) is also clear. We need public funding of parties, complete transparency of private funding and also far greater use of consultative forums.

Without political reform, little of what we need elsewhere will happen. If things then stay as they are, economic and political performance is likely to get worse, until our system of democratic capitalism collapses, in whole or in part.

The cause then is great. So is the urgency. We must not accept the status quo. It does not work and has to change. martin.wolf@ft.com

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