Billionaire Ray Dalio, manager of the world's largest hedge fund Bridgewater, recently shocked the world when he announced that "capitalism is failing" and that a "revolution" is coming.

There is no denying that global inequality is at unsustainable levels, and that interest-based economies are no longer fit for purpose (in many countries interest rates are too low to incentivise saving at all).

I believe that Islamic economics, with its 2.5% zakat wealth tax (and much lower taxes in other areas) might give us a clue on how to eliminate the worst social inequality. And with a prohibition of abusive high-interest businesses and the incentivisation away from interest-based savings accounts, it can reinvigorate the global economy. These are not just Islamic economic concepts; these are universalist traditional Abrahamic ethics, and a common sense way for us all to enjoy a truly free market.

Once we strip away the Arabic terminology, concepts like zakat can return our economies to the common sense-based, transparent and equitable set up that the architects of modern capitalism envisaged. Muhammed Yesilhark Philanthropist

Dalio’s statements matter, not only because of how strongly worded they are but also because of how topical they are in today’s news climate. They are significant because of who Dalio is, that is to say probably the most successful hedge fund manager in the world. One of my colleagues commented last week that this was the equivalent of the Pope declaring that Catholicism is failing.

Dalio’s words are perhaps more shocking because they violate one of the most sacred unwritten rules of the global rich: you’re not allowed to criticise capitalism if you have benefited hugely from it. Protest - or even displeasure - with the system is a luxury only the poor can afford. It’s normal to see cleaners, or even Uber drivers, angry at inequality. It is less normal to see the world’s wealthiest publicly stating that the order to which they owe their success is “not providing the American Dream.”

The “no protest for the rich” rule has led billionaires to channel their sense of responsibility, frustration or even guilt into philanthropy. This means that we seldom have the wealthy discuss these issues, let alone the root causes from which these problems arise. Those root causes go deeper than many of us realise and addressing them will mean re-examining not only our economics, but our politics and values.

Most of us want a societal order where there isn’t a huge vacuum between the classes. Unfortunately, this gap keeps widening as “casino capitalism” and high interest consumer products entrench divisions.

To create societies where there is mutual respect and compassion, we need an environment of reconciliation between the elites and the masses. The only way to achieve this is through a wealth tax such as the payment of zakat - one of the pillars of Islam - and an effective tool in addressing our current issues. But first, to reform a failing capitalism, we need to fix two things: taxation and the interest rate system. Taxation is easier (and far less left field) to critique since there is an emerging consensus that the global tax system simply no longer works. Through a combination of tax avoidance schemes, tax havens and even relatively innocent methods like transfer pricing, high net worth individuals and their corporations have very little (if any) tax to pay on their wealth. In the absence of effective wealth taxes, governments have no choice but to enforce taxes that perhaps unfairly target the poor, like sales tax and inheritance tax. The injustice of some of these taxes further normalises tax avoidance and polarises society even more.

Critiquing the interest rate system is more controversial. Most people feel that possessing money has some inherent value that should be recognised in a zero (or almost zero) risk way. But with negative interest rates spreading around in the developed world, interest rates are so low in many countries that they simply do not fulfil their purpose of incentivising consumers to save any longer. In short, as Deutsche Bank’s Jim Reid titled his research report last year, we might be witnessing “The Start of the End of Fiat Money.”

Therefore, our current fiat-based monetary system might require a rethink. After all, in the grand scheme of global economic history, it can still be considered an experiment as the vast majority of human history was based on gold and silver-backed sound money. Current proponents of digital currencies (such as so-called Bitcoin maximalists) are proposing a new form of supra-national sound money based on maths - quasi-“digital gold” for the globalised world.

Islamic economics, on the other hand, can give us clues to solve both these issues. Zakat, or Islamic alms, is a simple, transparent annual wealth tax of 2.5%. Let’s only consider tax havens, where estimated wealth of $10 trillion is held around the world. That means if zakat was paid on these funds (perhaps as some kind of amnesty agreement), there would be $250 billion per year flowing into the world’s poorest areas and worthiest causes.

At the same time, other taxes could be reduced or eliminated. In return for the wealth tax, Islamic economics suggests almost zero tax in every other area, including inheritance.

Solving the interest problem will be more gradual and will require a rethink of the monetary system we currently live in, as I previously mentioned. I can’t see a sudden global ban on interest but governments (particularly those with low interest rates) could incentivise other forms of investment, increasing regulation around abusive high interest products and businesses to start with.

Some of these might seem very drastic but once we strip away the Arabic terminology, concepts like zakat can return our economies to the common sense-based, transparent and equitable set up that the architects of modern capitalism envisaged.

When the richest guy in the room is telling you the game is rigged, it’s time to change the rules.

Muhammed Yesilhark is a philanthropist, a trustee of the UK National Zakat Foundation and founder of the Q2Q Foundation