society can become richer while becoming weaker.
Its markets can grow, its cities can prosper, its merchants can accumulate fortunes, and its treasury can fill. Yet beneath that visible wealth, the institutions and habits that made the prosperity possible can begin to deteriorate.
Abu Hamid al-Ghazali was concerned with precisely this problem more than nine centuries ago.
In his Ihya’ ‘Ulum al-Din, the great Muslim theologian and philosopher examined money, trade, wealth, markets and political power through a simple conviction: economy cannot be separated from morality.
When Money Becomes the Master
For al-Ghazali, money had a purpose. Gold and silver were valuable because they allowed people to exchange goods and establish their relative worth. Money is similar. Its social usefulness comes from what it enables people to produce, exchange and obtain.
That distinction is still relevant to the modern economy. Money today is not merely a medium of exchange. It is an asset, a store of value, a source of status and political influence, and increasingly an object of speculation in its own right. Financial markets can generate enormous wealth without necessarily increasing the production of goods and services. Capital can flow toward whatever promises the highest return, even when that return becomes increasingly detached from the productive economy.
The question al-Ghazali raises is therefore uncomfortable: when does money stop serving the economy and begin serving itself?
That is why he condemned hoarding. Money buried in the ground or locked away was, in his view, being prevented from performing its proper function and circulate through the economy. But the concern was not only what happened to money, but what happened to the person who possessed it. Wealth has legitimate uses, yet when accumulation becomes an end in itself, money can cease to be a means and become an object of attachment—even obsession.
The Market’s Promise—and Its Vulnerability
Markets perform a remarkable function. They take millions of individual decisions and translate them into prices that tell us something about scarcity, demand and value. But that function depends on a basic condition: participants must be responding to information rather than systematically distorting it.
Al-Ghazali recognized the same vulnerability. He was uncompromising toward merchants who withheld necessities or manipulated prices to create artificial scarcity. Profit was legitimate; profiting by obstructing the needs of others was not. The modern forms are different, but the problem is recognizable: when people with market power can manipulate scarcity, information or access for private gain, prices become less reliable signals of value.
Those distortions can take far more sophisticated forms today: privileged access and political connections can become more valuable than productive enterprise, information can be manipulated, and speculation can become detached from the real economy. The consequences become tangible: investors demand more compensation for risk, businesses become more defensive, and capital becomes less willing to flow toward uncertain activity.
The deeper problem is not simply that some people behave badly. It is that markets begin to change when enough people have an incentive to do so.
When Corruption Becomes the System
This is where al-Ghazali observations become more interesting. He understood that corruption is contagious.
A merchant cheats because others cheat. An official takes a bribe because the institution tolerates it. A ruler exploits public resources because power protects him. Eventually people stop asking whether something is right and start asking whether they can get away with it.
At that point corruption has ceased to be an individual vice. It has become an institutional culture.
And here Ibn Khaldun, writing roughly two centuries later, completes the picture.
Where al-Ghazali examined the moral psychology of wealth, Ibn Khaldun examined its civilizational consequences. In the Muqaddimah, he described how rulers become accustomed to luxury, expenditures rise, taxation increases, and excessive demands eventually weaken productive activity. As commerce and production decline, tax revenues fall; the state responds with still more extraction, accelerating the decline.
He also warned that when governments compete directly with merchants and farmers, they can undermine the very production that sustains the state.
Together, the two thinkers offer a powerful theory of decline:
Greed corrupts character.
Corrupted character corrupts markets.
Corrupted markets corrupt institutions.
Corrupted institutions distort incentives.
Distorted incentives weaken production.
Weak production weakens the state.
And eventually the civilization begins consuming the foundations of its own prosperity.
The Foundations of Wealth
The great danger to a wealthy society is not necessarily poverty. It is the moment when wealth becomes more important than the institutions that create it.
A civilization can survive scarcity. It can survive economic shocks. It can even survive periods of inequality.
What is much harder to survive is the widespread conviction that the game is rigged—that information is manipulated, rules are selectively enforced, political power can be converted into private wealth, and honesty is for those who cannot afford to be dishonest.
When that conviction takes hold, people do not simply lose faith in politicians or markets. They begin changing their economic behavior. They become more defensive and short-term in their thinking, more interested in protecting what they have than investing in what could be built.
Al-Ghazali would not have recognized today’s stock exchanges, central banks or global financial markets. Ibn Khaldun could not have imagined multinational corporations or digital currencies.
But both understood something that remains stubbornly modern:
An economy is not ultimately made of money. It is made of human beings deciding whether to trust one another.
And once a society loses that trust, its wealth may remain visible for a surprisingly long time.
