If you've ever looked at the shape of a city and wondered *why it ended up like this*—why this neighborhood has a park and that one has a freeway, why this culture prizes quiet and that one prizes loud, why your office feels the way it feels on a Tuesday morning—and you found yourself caught between "everything is just individual choices" and "everything is just blind fate," 共業 is the third option. It's the Buddhist analysis of how intentional action, when it's shared and aggregated, can shape something larger than any single actor: the world we all live in, and the way we all influence each other's minds.
The classical source for this concept in our record is the 《大乘阿毘達磨雜集論》 (Abhidharma-samuccaya, ascribed to Asanga, T1606), a Yogācāra-school treatise of the abhidharma genre. It's a text that likes to define things in pairs, and 共業 is paired with 不共業 ("non-common karma," individual karma). What I want to do in this piece is unpack what the text actually says, walk it through some contemporary scenes, and—perhaps most importantly—clear up the popular simplifications that the text itself is careful to avoid.
What This Concept Is Saying
The one-sentence definition, expanded
共業 literally: *sā* = together, *dhāraṇa* = holding/bearing. The classical definition, in two halves from the 《雜集論》:
「云何共業？若業能令諸器世間種種差別。云何不共業？若業能令有情世間種種差別。」
Translated: "What is 共業? It is karma that produces the various differences of the 器世間. What is 不共業? It is karma that produces the various differences of the 有情世間."
Two terms here need holding open, not collapsing:
- 器世間 (bājana-sattva-dhātu) — the "container world," the material environment. Mountains, rivers, weather patterns, the architecture of buildings, the layout of streets, the soil, the climate, the available light. Everything that *holds* sentient life. - 有情世間 (sattva-dhātu) — the "world of sentient beings" themselves: bodies, individual temperaments, personal life-circumstances, the specific way *this* person is constituted.
So the first half of the definition says: when karma produces differences in the *container*, we call it 共業. When karma produces differences in the *contents* (i.e., the individual beings), we call it 不共業.
This is already a non-trivial move. Most English-language readers, when they hear "karma," think immediately of individual karma: *I did this, so this happened to me.* The classical analysis insists there's a second, equally real kind of karma—karma that operates on the world-as-container rather than on you-as-individual. And this second kind is what we call 共業.
The second half: 共業 as mutual conditioning
But the 《雜集論》 does not stop there. It adds a second, complementary side:
「有一類業能令諸有情展轉增上；依此業力，有情相互對望而成為增上緣，因彼此具有增上之力，故亦名共業。由此勢力，各類有情能夠展轉互為諸心心法變異生因。」
Translated: "There is a kind of karma that causes sentient beings to 展轉增上 (sequentially, mutually uplift/condition) each other. By the power of this karma, sentient beings face each other and become 增上緣 (augmenting/supporting conditions) to one another; because each has augmenting power over the others, this too is called 共業. By this force, various classes of sentient beings can become, for each other, causes of variation in 諸心心法 (mind and mental factors)."
Four technical terms to keep open here, not flatten:
- 展轉 — sequentially, in a relay; one after another. Not "all at once," not "by agreement," but *in succession*, like a chain. - 增上 — augmenting, elevating, supporting. Not creating from nothing, but adding to, intensifying, providing a lift. - 增上緣 — one of the traditional six kinds of 緣 (condition) in Buddhist causal analysis. It means a condition that *helps something else to become stronger or to arise more fully*. (Think: water is a 增上緣 for a plant—it doesn't create the plant, but it helps the plant become what it is.) - 諸心心法變異生因 — causes that produce variation/change in minds and mental factors (心 = mind/cognition; 心法 = the fifty-one or so mental factors that accompany cognition, like attention, feeling, intention).
So the second side of 共業 is: when a karma-condition causes you and me and her and him to *mutually condition each other's mental states*—each of us becoming a 增上緣 for the others, in sequence—this too counts as 共業.
How the two sides relate
The two sides aren't competing definitions; they're two ways the same term lights up a phenomenon. Side one (器世間差別) is 共業 viewed from the *effect*: the world-as-container ends up varied, and that variation is the result of shared karma. Side two (展轉增上) is 共業 viewed from the *causal process*: the karma is shared because the actors share in being mutual conditioning-factors for each other's minds.
A helpful image: imagine a long-running potluck dinner. Side one is the *room* after everyone has contributed—a particular layout of tables, a particular smell, a particular hum. Side two is the *process* of one person's dish influencing what the next person decides to bring, which influences what the next person thinks about cooking. The room's final state is 共業-by-effect; the chain of influence among the cooks is 共業-by-process. Both are "common" in different senses.
What the text is carefully *not* saying
This is the part that needs slow emphasis, because popular usage usually blurs it. The 《雜集論》 does not say:
1. That all 共業 is *made the same way* by all the beings who share in it. 2. That all beings involved in 共業 necessarily *receive the same result*. 3. That 共業 is identical with the category "與多眾生共所行" (that which is performed together with many sentient beings), even though they share the character "共."
That last one is particularly important. The text separately analyzes 強力業 (karma of great force) and lists *nine* causes that make a karma "forceful." One of those nine causes is "與多眾生共所行故"—because it is performed jointly with many sentient beings. But the text does *not* redefine 共業 through this category. They overlap in vocabulary, but they are not the same definition. 共業 is defined by its *effect* (器世間差別, 展轉增上). 強力業's "joint performance" is a reason a particular karma becomes *forceful*. To fuse them is to lose precision.
Walking Through It in Daily Life
Now let us walk this concept through some scenes. I will keep the two sides separate, because they map onto different things in lived experience, and the mapping is easy to get wrong.
Side One walkthrough: 共業 as 器世間差別
Scene A — the morning commute. You live in a city where the subway is overcrowded, the buses are unreliable, and the roads have been repaved three times in five years. You didn't decide this. The mayor before you didn't fully decide this either. The shape of the transit system—the fact that it prioritized private cars in the mid-twentieth century, that it underfunded rail, that it built the highways through certain neighborhoods and not others—reflects *aggregate decisions* made by many people over many decades, each acting locally, each with their own intentions, but the *aggregate pattern* shaping the container you inhabit.
Mapped to the classical definition: this is the *container* (the transit infrastructure, the zoning, the road geometry), and it has *differences* (from how another city's container is shaped). The classical claim is that this kind of difference is the fruit of 共業—karma shared in the sense that it produces a common environment. Crucially, this does *not* require that every car-commuter in the 1950s had identical intentions, nor that every bus-rider today receives the same outcome from that aggregate karma. They participate in different roles.
Scene B — the local food ecosystem. Why does this neighborhood have farmers' markets and that one only has convenience stores? Why is fresh produce cheap here and expensive there? The container differs. Zoning, supply chains, agricultural subsidies, generations of land-use decisions—aggregate karma shaping the container.
Scene C — the climate of a region. The 《雜集論》 is talking about weather and physical geography when it invokes 器世間. We don't need to commit to a particular metaphysical claim about *how* karma produces weather to use this category carefully: it points to the fact that the *container* is something that has been shaped, and that the shaping is not reducible to a single actor.
Where the mapping commonly *fails*: people often slip from "the container differs" into "therefore *that group* of people deserved the earthquake / drought / pandemic." The classical text, as we noted, does not say all co-participants in 共業 must share the same fruit or the same intention. The container is shaped by aggregate karma; how any given individual is affected by that container remains a distinct question, and individual 不共業 continues to operate.
Side Two walkthrough: 共業 as 展轉增上
Scene D — the Monday morning meeting. Three people walk into a meeting feeling neutral. One of them is slightly anxious about a deadline. Their anxiety shows up in their body language—they speak faster, hedge more, glance at the boss more often. The second person, who would have been calm, picks up on this and becomes slightly anxious too. The third person, who walked in neutral, now enters a room where two people are subtly anxious, and becomes anxious in turn. By the end of the meeting, all three are more anxious than they would have been alone. Each was a 增上緣 for the others; the anxiety was *generated in succession*, not by agreement; no one decided this outcome, but the karma of how each person *carried themselves* (intentionally or not—body language can be intentional) functioned as mutual conditioning.
This is 共業 in the second sense. Each participant in the meeting was a 增上緣—a supporting condition—for the variation in the others' minds.
Scene E — the social media feed. You engage with a post. The algorithm registers your engagement and shows that post to more people, who engage more, which causes the algorithm to show it to still more people, which causes their engagement to feed back into what you see tomorrow. Your engagement shapes what others see; their engagement shapes what you see. This is 展轉增上 with an algorithmic substrate. (Note the limit of the analogy: algorithms amplify and select; they do not have 業 in the technical Buddhist sense. The analogy shows the *structure* of mutual conditioning, not that algorithms are doing karma. Also, the actual mental-state variation that comes from being exposed to a feed is one thing; the algorithmic amplification is another. The classical category 展轉增上 is most properly applied to beings that intentionally influence each other's mind-states, though the principle of mutual conditioning is structural.)
Scene F — the intimate relationship. Two people in a long partnership: one becomes slightly withdrawn because of work stress. The other interprets the withdrawal as rejection and becomes slightly colder. The first, feeling the coldness, withdraws further. This is the relational version of 展轉增上—a feedback loop in which each partner is the 增上緣 for the next move, and the loop is not designed by anyone, but it is co-produced.
Scene G — the family across generations. A parent responds to their child with a certain tone. The child internalizes that tone and carries it into adulthood. As an adult, the child (now a parent) responds to *their* child with a similar tone. The grandparent, the parent, the child: each was a 增上緣 for the next's emotional patterning, in 展轉 succession. The text's phrase 諸心心法變異生因—"causes that produce variation in mind and mental factors"—is exactly this: each generation was a cause for variation in the next generation's mental factors.
Where the mapping commonly *fails*: people often think 展轉增上 means *blame*. "You made me anxious in that meeting." But the classical category is more interesting than that. It says: each was a condition for the others. You don't need a single villain; you have a system. 共業 in this sense is a way to think about *systemic* mutual causation without dissolving individual responsibility into it. Each person *was* a condition; each person could also, with effort, choose to *not* be that condition, or to be a different kind of condition. That's where 不共業 re-enters the picture—your individual karma determines *how you show up* in the field of mutual influence.
A combined walkthrough: a workplace over years
Now stitch them together. A workplace's container (its physical layout, its policies, its rituals, its unspoken norms) was shaped by aggregate decisions of past employees, managers, founders—*that* is 共業's first side. The way that container then influences how the current workers feel and behave—how a particular office layout, with its open-plan noise, its performance metrics, its Friday-afternoon drinks, *conditions* each worker's mind and mental factors—*that* is 共業's second side, working through the container that the first side produced.
This is, I think, where the concept earns its keep for contemporary readers: it lets you talk about systemic, structural, container-level phenomena without either denying the individual, or dissolving the individual into the system.
Why Contemporary People Need This Concept
Three reasons stand out, and they aren't equally easy.
1. The ecological crisis is, at its core, a 共業 phenomenon. The container of the planet has been shaped by aggregate human action. The climate, the oceans, the soil, the air—these are 器世間 being modified by karma-shared. The classical category gives us a vocabulary for this that doesn't require either "individuals are responsible" (true but inadequate) or "the system is responsible" (true but inadequate). It says: the system *is* the aggregate of intentional actions, and aggregate of intentional actions is exactly what 共業 names. We need this concept because we need to think clearly about how a world gets to be the way it is when no one decided it to be that way but many people decided small things.
Note the limit of the analogy: the classical Buddhist framework makes metaphysical claims about how karma actually functions that contemporary ecological science does not make or need. The category is useful because the *structure* (aggregate intentional action shaping a shared container) is recognizable. It would be a mistake to claim that science has "proven" Buddhist karma-theory; it would also be a mistake to claim that the structure is somehow unavailable to non-Buddhist description.
2. Institutional and cultural patterns are 共業 phenomena. Why does this company have a certain kind of meeting culture? Why does this discipline have a certain epistemic style? Why does this family pass down a certain pattern of relating? The classical answer involves 不共業 (the individual karma each person brings) and 共業 (the container that the aggregate has shaped, and the mutual conditioning that occurs within it). Neither alone is sufficient. The contemporary habit of either blaming individuals ("the meeting culture is the CEO's fault") or blaming systems ("no one is responsible, the system is") misses the way the two layers interpenetrate. 共業 is the term for the layer that lives between individual and abstract system.
3. The concept offers a non-moralizing way to talk about collective suffering. When something bad happens to a community—a pandemic, an economic collapse, an environmental disaster—the instinct is either to *blame* the community ("they must have done something wrong") or to *randomize* it ("it was just bad luck"). Both responses are inadequate. 共業 offers a third: the community's *container* was shaped by aggregate karma; how any individual within the community fares within that container is a separate question; the aggregate and the individual levels each have their own causal logic. This is much more useful for grief, for policy, for ethics than either blame or randomness.
Common Misreadings and Clarifications
Misreading 1: "共業 means everyone did the same thing and gets the same result."
This is the popular version. It is not what the 《雜集論》 says. The text is explicit: it does not assert that all co-participants acted identically, nor that all share the same fruit. The defining feature of 共業 is its *scope of effect* (the container, or the mutual conditioning), not uniformity of action or outcome. A city can be the fruit of 共業 even though the people who shaped it had wildly different intentions, and the people who live in it now are affected in wildly different ways.
Misreading 2: "National karma," "racial karma," "generational karma" as deterministic categories.
When people say a country or people "has bad karma," they are usually collapsing several things: (a) the container they live in has been shaped by aggregate past action (true, and this is 共業's first side); (b) the people themselves bear a collective guilt or fate (this is *not* what 共業 says). The 《雜集論》 does not license the conclusion that members of a group share responsibility for, or fate from, the aggregate karma of their group. The container is shared; the karma of each person within it remains that person's 不共業.
This misreading is particularly worth resisting because it has historically been used to blame groups for their own suffering. The classical framework gives us no warrant for that. It gives us a way to talk about how a group-shaped container constrains and enables; it does not give us a way to declare that any given person deserved what happened to them.
Misreading 3: Conflating 共業 with 強力業's "與多眾生共所行."
These share vocabulary, but they are not the same. 共業 is defined by its *effect on the container or on mutual conditioning*. 強力業's category of joint performance is a reason a particular karma becomes forceful. A jointly-performed action can produce individual, not common, results; a non-jointly-performed aggregate of actions can still be 共業 by virtue of shaping the container. The text is careful to mark this.
Misreading 4: "If the container is shaped by 共業, individuals don't matter."
This is the inverse error. The classical framework maintains *both* layers. 共業 shapes the container. 不共業 shapes how each person is constituted and how each person acts within the container. Your individual karma determines how you show up in the field of mutual conditioning—which means your individual karma is exactly what allows you to be a *different kind* of 增上緣 from what the system would otherwise default to. The meeting room's anxiety is 共業; your decision to breathe, soften your body language, and not transmit the anxiety is *your* karma, working within and against the shared field.
Misreading 5: "共業 means fatalism; if the world is the way it is because of aggregate karma, nothing can be done."
Fatalism is a category error here. 共業 is the name for *how* the world came to be shaped by aggregate action. To recognize that is to recognize that *future* aggregate action will shape the *future* container. The category does not say the container is fixed; it says the container is *karmically* shaped, which means it is shaped by what intentional beings do. If the present container is uncomfortable, the work is not to resign oneself to it but to understand the kind of aggregate action that produced it, and to participate in different aggregate action. This is why the 展轉增上 side is so important: it locates the lever precisely in the fact that each of us is a 增上緣 for the others.
A closing thought. The 《雜集論》 gives 共業 two sides—container-shaped-by-aggregate, and beings-mutually-conditioning-each-other—and refuses to let either side collapse into the other. That refusal is the teaching. We live in a world whose *shape* is the result of no one in particular deciding it, and we live in webs of mutual influence in which each of us is, right now, becoming a condition for what others' minds will do next. The two sides are not separate problems; they are two faces of one phenomenon. The container we live in was made by the mutual conditioning; the mutual conditioning is the container, in its living form. To see this is not to despair and not to be smug. It is, as the Buddhist tradition might say, to begin to see what is actually going on.