Almost all sectors of our global economy are also now characterized by monopoly power, as is detailed by Nick Shaxson in his great new book, the Finance Curse. Whether food, pharmaceuticals, media, finance, or technology, each sector is characterized by a handful of huge corporations.

Decades of largely unquestioned mergers and acquisitions, where corporations have bought up competitors, have led to this. Historically, and especially in the United States in the early part of the 20th century, monopoly power was rightly viewed as a serious threat to the economy and to society, and steps were taken to break up monopolies. It was President Franklin Roosevelt who famously said that “government by organized money is just as dangerous as government by organized mob.” However, in recent decades, neoliberal economics has led a much more benign view of monopoly power, and very little action is now taken to dismantle them. I think this is a key distinction between neoliberalism and classical liberal economics. These monopolies impose hidden monopoly taxes on every consumer, as it enables these companies, and their wealthy shareholders, to extract excessive profits from the market, directly fueling the growth in extreme wealth at the expense of ordinary citizens.

The actions of corporations, including the move towards monopoly, are driven by a relentless focus on ever-increasing returns to shareholders — shareholders who are primarily the very same extremely wealthy people. Our new Oxfam paper on the “Seven Deadly Sins” of the G7, released this week, shows how returns to shareholders have increased dramatically whilst real wages have barely increased.

Behind corporate power and corporate actions is increasingly the power of super-rich shareholders.

Once billionaire wealth is accumulated, the way it is used also casts doubt on how useful it is to have billionaires. The super-rich use their wealth to pay as little tax as possible, making active use of a secretive global network of tax havens, as revealed by the Panama Papers and other exposes.

One ground-breaking study that made use of this leaked information showed that the super-rich are paying as much as 30 percent less tax than they should, denying governments billions in lost tax revenue, that could have been spent on schools or on hospitals. The super-rich are supported in this by the Society of Trust and Estate Practitioners (STEP), a secretive organization of over 20,000 wealth managers that actively pressures governments to reduce taxes on the richest.

Billions are not just used to ensure lower taxes. They can also be used to buy impunity from justice, to buy politicians, or to buy a pliant media. The use of “dark” money to influence elections and public policy is a growing problem all over the world. The Koch brothers — Charles and the recently deceased David — two of the richest men in the world, have had a huge influence over conservative politics in the United States.

Another recent Oxfam study showed the many ways in which politics has been captured by the very rich in Latin America. Many of today’s new breed of nationalist, racist leaders have substantial financial backing.

This active political influencing by the super-rich directly drives greater inequality, by constructing reinforcing feedback loops, in which the winners of the game get even more resources to win even bigger next time.

For all these reasons, I think there is a strong case to be made that rather than being celebrated, as one U.S. commentator recently said, “every billionaire is a policy failure,” and that in particular if we are to end poverty and build fairer societies, we need to bring an end to extreme wealth.