Lesson · 4 min Steady
The Shrinking Tax
In one line Ibn Khaldun noticed that light taxes can raise more than heavy ones, because heavy ones crush the work they tax.
Ibn Khaldun watched dynasties rise and fall across North Africa, and he noticed a pattern in their money. At the start of a dynasty, he wrote, low tax rates bring in a large revenue. Toward its end, high rates bring in a small one.
The reason lies in people. When taxes are light, farmers and merchants keep enough of what they make to want to make more, so business grows and so does what the state collects. As rulers grow used to luxury, they raise taxes again and again. People lose the reason to work and trade, business shrinks, and the heavier tax brings in less than the lighter one did.
The lesson reaches beyond taxes: pressing harder on something can shrink the very thing you are pressing on.
Go deeper
In the 1970s the economist Arthur Laffer cited this passage of the Muqaddimah when he argued that above some rate, higher taxes lower revenue. Economists still argue about where that point lies for any real economy, and Ibn Khaldun gave no number. His contribution was the mechanism: incentives connect what rulers demand to what people produce.
The market stalls
A town doubles the fee for a stall at its weekly market to pay for repairs. The next year it takes in less: a third of the traders stop coming, and shoppers follow them.
The council lowers the fee and waives it for a trader’s first month. Stalls fill up again, and the fees collected rise. A lighter demand brought in more.
Try this today Think of a rule, fee or demand you set; ask whether making it heavier would get you more of what you want, or less.
Cite or share this lesson
A plain reference you can paste into notes or an essay:
Quest2Reason. “The Shrinking Tax.” https://quest2reason.com/learn/lesson/the-shrinking-tax. Accessed 13 November 2026.
Sources
- Ibn Khaldun, The Muqaddimah (Rosenthal translation, muslimphilosophy.com) — Chapter 3 on dynasties, including the passage on taxation yielding large revenue from small assessments early and small revenue from large assessments late. Paraphrase.
- Wikipedia, “Laffer curve” — Quotes Ibn Khaldun’s taxation passage as an early source of the idea, and shows how widely economists’ estimates of the revenue-maximizing rate vary.