When Knowledge Is Cheap, Insight Is Everything: Jevons Paradox applied to Torah Learning

In 1865, an English economist named William Stanley Jevons published a book that almost no one reads anymore. It was called The Coal Question, and it argued that Britain was about to ruin itself. The argument turned on a paradox so counterintuitive that Jevons spent most of the book establishing it was real before he allowed himself to draw conclusions from it.

The puzzle was this: James Watt’s improved steam engine, patented in 1769 and refined for decades after, was by design a more efficient machine. It produced more mechanical work from less coal. Every reasonable observer predicted that Britain would consume less coal as Watt’s engines spread. The math was airtight: a given amount of coal now produced more useful energy; therefore, to produce a given amount of useful energy, you needed less coal; therefore, total coal consumption would fall. Jevons looked at the numbers and discovered that the opposite had happened. Between Watt’s patent and the publication of The Coal Question, British coal consumption had risen more than tenfold.

What Jevons saw was that efficiency generates demand. Cheaper steam power produced applications for mechanical work that had been economically impossible at the old prices. Railroads became viable. Iron smelting became cheap enough to industrialize. Ocean shipping was reorganized around coal-fired engines. The savings per engine were real, and they were swamped completely by the proliferation of engines.

Jevons drew a darker conclusion than the one he is now remembered for. He thought Britain would exhaust its coal reserves within a century and lose its industrial supremacy as a result. He was wrong about that, because he could not foresee oil. But the underlying observation, that efficiency in an input produces explosive growth in demand for that input, turned out to be one of the most durable findings in economics. It is now called the Jevons paradox, and it shows up everywhere people study the diffusion of new technology. Cheaper lighting lengthened the working day and lit up the night sky. Cheaper computation built an information economy that now consumes more electricity than most countries. The pattern repeats. When the cost of an input collapses, that input becomes the substrate of a world that could not previously exist.

We are about to learn this lesson again. The input this time is knowledge, and the place we are about to learn it first is the Jewish study hall.

For most of human history, access to the great Jewish textual traditions was rationed by labor. To read Maimonides in his own twelfth-century Judeo-Arabic, you needed years of training. To trace a legal argument across the Babylonian Talmud, the Jerusalem Talmud, the medieval commentators, and the early modern halakhic authorities, you needed a library most people never set foot in and a lifetime most people never had. Even after the printing press, even after the digitization of nearly the entire corpus on the open-access platform Sefaria, the actual capacity to make these texts speak to you, to ask them a question and receive a real answer, remained the property of a small guild of trained readers. The cost of consulting the tradition was high, and so consultation was rationed.

LLLms like Yochai and Rav Dicta — along with base models themselves — have collapsed that cost. A teenager in the Israeli desert town of Be’er Sheva with a phone can now ask a question about the meaning of a difficult line in Rashi’s commentary on the Bible and receive, within seconds, an answer that draws on works she has never heard of, in a language she actually speaks, calibrated to her level. The corpus has not changed. The cost of consulting it has fallen by orders of magnitude.

A reasonable person, watching this happen, might predict that the role of the rabbi, the traditional human interface to the corpus, is about to contract. If anyone can ask the tradition a question, who needs the person who used to answer it? This is the wrong prediction, and Jevons explains why. The cost of consulting Torah is collapsing while the demand for what Torah is supposed to produce stands to explode. When consultation gets cheap, the bottleneck migrates somewhere else. It migrates to a place the tradition has been pointing at for fifteen hundred years and almost nobody, including the rabbinic world itself, has organized its life around.

The bottleneck moves to chiddush, a Hebrew word that means, roughly, the production of genuine new insight from inherited material. The English word innovation gives the wrong flavor. So does originality. Chiddush is closer to seeing something true that nobody saw before, in a text that was already there. It is the act of reading that produces, rather than the act of reading that absorbs. The rabbinic tradition has held for a very long time that this act is what Torah study is for, and that without it, the study hall is not really functioning. The Talmud states this directly: a house of study cannot stand without chiddush (Chagigah 3a). By which the tradition means: without something new being seen, what is happening in the room is no longer Torah, however many books are open on the tables.

It is worth pausing here to note that the rabbinic tradition was not, in the nineteenth century, sitting around waiting for an English economist to explain to it how human desire interacts with supply.

The book of Kohelet, known in English as Ecclesiastes, already observed that the eye is not satisfied with seeing, nor the ear filled with hearing (Kohelet 1:8). The Talmud, in Sukkah 52b, sharpens the principle into a structural law: there is a small organ in a person, the Gemara says, which when starved is satisfied and when satisfied is starved. On the same page, the sage Abaye generalizes: the greater a person, the greater his appetite. The early rabbinic anthology Kohelet Rabbah (1:13) gives the principle its proverbial form: a man with a hundred wants two hundred. The eighteenth-century ethical work Mesillat Yesharim, the standard Jewish text on moral psychology, makes the same observation as a developmental claim: indulgence does not satisfy desire, it expands desire’s capacity (chapters 1 and 13). The nineteenth-century commentator Malbim, glossing the book of Proverbs (21:17), says the same of pleasure as such: attachment enlarges want rather than quieting it.

What the tradition was abundance generates further appetite. This is the same observation Jevons made about coal, transposed from industrial input to human desire. Or rather, Jevons’s observation about coal is the same one Kohelet made about the eye, transposed from human desire to industrial input.

Now we can return to the line from Chagigah 3a: a house of study cannot stand without chiddush (novel insight). The reason a house of study cannot stand without chiddush is precisely what Kohelet identified about the eye and Jevons identified about coal. Abundance generates further appetite. A learner with access to a tradition will be moved, by the structure of desire itself, to want more from it than the tradition has yet given. The only thing capable of meeting that expanded appetite is the production of new insight from inside the tradition.

For most of Jewish history, this collapse was avoided through a brutal economic fact. Producing chiddush required so much preparatory labor (reading the text, the parallel texts, the commentaries on the text, the commentaries on the commentaries) that the appetite was, for most learners, suppressed by the impossibility of feeding it properly. The obligation to produce chiddush, which the Talmud frames as universal, was theoretically binding on every learner and practically binding only on the small number of people who could afford the labor. The practical fact ate the theoretical principle for breakfast, and the tradition, with some discomfort, accommodated the discrepancy by treating chiddush as the elite achievement of a few rather than the obligation of all.

What happens when the practical fact changes?

You are commanded to produce something new.

When the cost of consulting a corpus falls, two things happen at once. Demand for the corpus increases. More people consult it, more often, about more things. That part is obvious. The less obvious part is that the bottleneck migrates.

When books were expensive, the binding constraint on Torah was access to books. When print loosened that, the constraint became literacy. When literacy spread, the constraint became time. When time pressures eased, the constraint became guidance: someone to tell you which page to open and why it mattered. Each loosened constraint revealed the next.

AI loosens the constraint of consultation: the friction of finding, translating, and contextualizing relevant sources. The deeper constraint is chiddush itself: the production of genuine new insight from the material now so easily at hand.

Here Jevons hands off to the French economist Jean-Baptiste Say. Say’s proposition, that supply creates its own demand, was a claim about how new productive capacity reshapes desire. When sewing machines lowered the cost of clothing, people began to imagine wardrobes. When recorded music lowered the cost of hearing a symphony, people discovered that music could accompany every hour of the day. New supply generated demand that had not previously existed because it had not been imaginable.

Cheap consultation of the corpus will do the same to chiddush. When a learner can, in an afternoon, gather every source the medieval commentators cite on a given verse along with their full midrashic and halakhic afterlife, the question that suddenly becomes pressing is what do I see, having seen what they saw? The supply of accessible material generates a demand for synthesis that did not exist when the material was inaccessible. A student who two years ago could spend a semester just locating the relevant texts can now spend that semester actually thinking with them. The chiddush has nowhere to hide.

For most of Jewish history a serious learner could honorably say, I would produce chiddush if I could, but I cannot. The corpus is too vast, my time is too short, my teachers are too few. That sentence has expired. The obligation has gone from aspirational to operational.

The first objection runs that AI-assisted chiddush is not really chiddush. The model did the work. The human pressed the buttons. To call the output an insight is to debase the word.

This objection depends on a particular theory of what chiddush is. If chiddush is invention, the addition of something new to the tradition from outside it, then yes, scaling production cheapens the currency. The rabbinic tradition has always understood chiddush differently. Chiddush is recovery: the surfacing of structure that was always present in the gift but not yet visible.

The locus classicus is in the Talmud, tractate Menachot 29b. Moses ascends to heaven and finds God tying ornamental crowns onto the letters of the Torah. He asks why. God tells him that one day, generations hence, a man named Akiva ben Yosef will derive heaps and heaps of laws from each one of those tags. Moses asks to see him. God tells him to turn around, and suddenly Moses is sitting in the eighth row of Akiva’s study hall. He cannot follow the discussion. He does not understand what the students are saying. His strength fails him. Then a student asks Akiva where some particular ruling comes from, and Akiva answers: halakha l’Moshe miSinai, a law given to Moses at Sinai. And Moses, the text says, is settled.

Everything turns on what settles him. Akiva’s chiddush, which Moses himself could not have produced, traces back to him. The thing Akiva sees was always there, implicit in the gift, waiting for someone with eyes to surface it.

This is the rabbinic theory of chiddush in compressed form. The Torah has a structure with depth, and chiddush is the surfacing of structure that was always present but not yet visible. The crowns were tied at Sinai. Akiva became their reader. If this is what chiddush is, the worry about scale dissolves. There is no risk of running out of crowns. The tradition has no upper limit on the structure it contains, because the structure is the surplus of revelation over comprehension. Every generation surfaces what its tools allow it to surface. The early rabbinic sages saw one set of crowns; their medieval successors saw another; each set saw what their methods made visible. There is no reason to think we have reached the end of what is recoverable.

A second objection runs deeper. Even granting that chiddush is recovery and that AI can lower the cost of the preparatory work, something disordered remains about a world in which insight becomes cheap. A tradition is more than its insights. Cheap chiddush, the worry goes, produces a population of solo learners typing prompts into a chatbot, each generating private surfacings, none of them building anything together. The corpus survives; the people of the book don’t.

This is the right worry, and the tradition met it on the same page of the Talmud as the Akiva story. In Bava Metzia 85b, the third-century sage Reish Lakish is marking the burial caves of the great rabbis. He locates them all except for the cave of Rabbi Chiya, which keeps eluding him. He breaks down. Did I not analyze Torah like Chiya? A heavenly voice answers: yes, you analyzed like him. You did not spread like him. Chiya, the voice says, sowed flax. From the flax he made nets. With the nets he trapped deer. He fed the meat to orphans and made parchment from the hides. On the parchment he wrote the five books of Moses. He went to towns with no teachers and taught five children five books and six children six orders of the Mishnah, and told them: until I return, teach each other. In this way, he said, I have made it so that Torah will not be forgotten from Israel.

Reish Lakish was a virtuoso of analysis. Chiya was a builder of rooms. The heavenly voice’s verdict ranks them: peerless analysis without spreading is enough to lose your cave. The rabbi whose work survives is the one who builds the room in which others learn.

A different Talmudic debate, in Horayot 14a, stages the same tension as institutional politics. The question is which is greater: Sinai, meaning the master of the corpus, the one who has read everything, or oker harim, the uprooter of mountains, the master of original insight who tears the tradition open. The community votes Sinai, with the slogan that everyone needs the master of wheat (a play on the Aramaic for master of the corpus). The academy, in lived practice, gave its presidency to the mountain-uprooter, the third-century sage Rabbah, for twenty-two years. The official answer and the lived answer diverged. We are about to experience that divergence sharply. The wheat is being technologized. The question of who can do something with it is going to dominate everything.

There is a small parable in the kabbalistic tradition. A man from the mountains comes down to the city, eats bread for the first time, and asks what it is. He is told it is made from wheat. He returns to his mountain, gathers raw wheat, eats it dry by the handful, and goes home convinced he has tasted what the city tastes. He has eaten the input. He has missed the thing made when the input is ground and kneaded and salted and left to rise and finally exposed to fire. Bread lives only in the baking.

AI is the new master of wheat. It is unusually capable at producing the relevant source, the right translation, the missing citation. Information was never the goal. A learner who consumes AI-generated wheat by the handful, who asks ChatGPT for the meaning of the weekly Torah portion and stops there, has eaten dry grain and gone home thinking she has tasted Torah. She has tasted the input. The tradition lives in what gets made from it.

The vocation of the learner in the age of cheap wheat is to become a baker: to take the now-abundant raw material and turn it into something a human can eat. Chiddush that surfaces structure. Communities that perpetuate the learning. Students who teach each other when the teacher is gone. This is true for the rabbi and it is true for the nineteen-year-old in Be’er Sheva, because the obligation was always universal in principle (Chagigah 3a). The economics restricted it. The economics just changed.

Jevons’ coal built a new England, more dependent on coal than the old one and more capable of using it. Cheap knowledge will build a new Torah world, more dependent on the corpus than the old one and more capable of working it. The question is whether the people inside that world will recognize the work for what it is and pick up the rolling pin.

I write from my perspective as a rabbi and teacher of Torah, but the arguments I make here well apply to academic knowledge production, too.

If you enjoyed this piece, you might enjoy Alexandria - our great books library with an AI tutor in the margins.