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Every negligence case begins with facts, so let us build one carefully. Imagine a fictional grocery store called Marlowe's Market, located in a small California

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town. One Saturday afternoon, a customer named Dana Reyes reaches into a self-serve olive bar and knocks over a small carafe of oil.

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Within minutes, a slick sheen spreads across the nearby tile floor. A short time later, Dana slips while walking past the bar, fractures her wrist,

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and later claims the store was negligent. The store disputes nearly every part of that story.

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Dana says the spill sat unattended long enough that a careful employee should have noticed it.

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The shift manager, Chris Alvarez, says a coworker wiped the area about ten minutes before the fall, and another shopper may have dropped oil again

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afterward. A security camera captured part of the aisle, but not the exact moment Dana fell.

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Dana also admits she was glancing at a shopping list on her phone as she walked.

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Notice how much turns on these disputed details. This one scenario will carry our entire course.

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In each section we will isolate a single legal question: duty, breach, causation, the scope of liability, damages, and finally defenses.

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Keeping one hypothetical helps us see how the elements connect instead of memorizing unrelated definitions.

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Remember, this is a teaching example, not a real case, and California materials serve only as official illustrations.

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Before we can ask whether Marlowe's Market acted carelessly, we must ask a prior question: did the store owe Dana any legal duty at all?

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Duty defines the relationship that makes one party's carelessness legally actionable by another. Without a duty, the analysis ends before we ever reach breach or

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causation. California gives us a useful official illustration. Civil Code section 17 14 expresses a broad principle: everyone is responsible for injury they cause to

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another through a want of ordinary care in managing their property or person. Paraphrased simply, the statute sets a general default duty of ordinary care,

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subject to qualifications that statutes and case law may add. Applied to our hypothetical, a store that opens its doors to customers generally owes ordinary

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care in managing the premises, including the floors customers walk on. For Marlowe's Market, the duty question is therefore fairly straightforward.

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Dana was a lawful customer, the fall happened inside the store, and the hazard involved the store's own floor.

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Under a section 1714-style general duty, the store's obligation does not depend on proving employees were careless.

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The duty exists first; breach is a separate, later question. Two cautions keep this honest.

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Duty can be limited or shaped by statutes, relationships, and jurisdiction-specific doctrine, so this California illustration is not a universal rule.

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And identifying duty never decides the case by itself. The real dispute here is whether the store performed its duty reasonably.

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Breach asks whether Marlowe's Market failed to use reasonable care, given what it knew or should have known.

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California provides an official illustration here. The Judicial Council’s official civil jury instructions provide useful guidance, and its negligence instructions, paraphrased, ask two things: whether

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the defendant failed to use reasonable care to avoid harming someone, and whether that failure was a substantial factor in causing harm.

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The reasonable-care inquiry weighs the likelihood of harm, the seriousness of a potential injury, and the burden of taking precautions.

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Now apply that structure to our disputed facts. The likelihood of harm from oil on a tile floor near a self-serve station is significant, and

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a fractured wrist is a serious injury. The burden of precautions is low, because periodically inspecting a known spill-prone area is inexpensive.

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So if the store knew, or should have known through reasonable inspection, and failed to clean or warn, a breach finding is well supported.

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But the store's defense attacks the knowledge element. Chris Alvarez says a coworker cleaned the area ten minutes before the fall, and that account may

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support reasonable care, but does not conclusively establish it. The partial camera footage means the timing is genuinely contested.

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Breach, in other words, is a fact question that turns on which story is believed.

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Suppose the jury finds Marlowe's Market breached its duty. Dana still must prove that the breach actually caused her fall.

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Factual causation asks a counterfactual question: if the store had used reasonable care, would Dana have been injured anyway?

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Courts commonly express this through but-for reasoning, and California's official instructions, paraphrased, use the substantial-factor formulation we encountered earlier.

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Test our facts. If the jury credits the cleanup account, the floor was dry ten minutes before the fall, and a later shopper re-spilled the

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oil. In that version, reasonable care by the store would not have prevented Dana's fall, because the hazard that injured her did not exist when

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the store last had a reasonable chance to address it. Causation may fail, but only if reasonable precautions would not have prevented this fall.

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If instead the jury believes the oil sat unattended for a substantial period, a timely inspection would have cleaned or flagged the spill, and Dana

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would have walked past safely. In that version, the breach is a factual cause of her injury.

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Dana's phone use complicates the picture without resolving it. Her inattention does not, by itself, answer the causation question.

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The issue is whether the store's breach was a substantial factor in bringing about the harm, not whether Dana was also careless.

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Her conduct matters later, at the defenses stage. The teaching point is that causation is a separate gate, not an automatic conclusion.

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Factual causation tells us whether the breach played a role in the fall. Scope of liability asks something different: whether the harm Dana suffered is

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the kind of harm that makes the breach legally actionable. A duty of ordinary care regarding a store floor exists to protect customers from precisely

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this sort of injury, a slip and a fracture. On our facts, the wrist fracture falls comfortably within the scope of liability.

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More remote consequences, like an unrelated injury Dana suffered weeks later in a separate incident, would raise harder scope questions our hypothetical does not need

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to resolve. With the liability elements in place, the analysis turns to damage, the measurable loss the law can address.

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Dana's damages would typically fall into two groups. Economic damages are quantifiable: emergency care, follow-up treatment, physical therapy, lost wages from time away from work,

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and any reduced earning capacity if the fracture heals poorly. Noneconomic damages address the less tangible harm: pain, and the way the injury interferes with

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daily living. In a real dispute, records and expert testimony would establish these amounts; here we simply note the categories.

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Two cautions apply. Damage rules, including any limits on particular categories, vary by jurisdiction, so this illustration cannot be generalized.

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And damages must be proved with evidence, not presumed. At this point the plaintiff's case looks

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complete: duty, breach, factual causation, scope, and damage. But the defendant still has tools available.

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A negligence analysis is not finished when the plaintiff's elements are established, because defenses can reshape the result.

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The most important defense here is comparative fault. Dana admitted she was reading a shopping list while walking past a spill-prone station.

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Under California’s pure comparative fault system, a factfinder can allocate responsibility between the parties, reducing the plaintiff's recovery by her share of fault rather than

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eliminating it entirely. If a jury found the store substantially at fault for failing to inspect, and Dana modestly at fault for inattention, her recovery

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would be reduced accordingly, not barred. The store might also argue that Dana appreciated and voluntarily encountered the risk, a defense sometimes described as assumption

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of risk. On these facts, that argument is weak. Dana did not choose to encounter spilled oil; she simply failed to notice it.

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Knowing risk-taking may instead count as comparative fault; a warning alone does not erase the store’s duty.

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A balanced conclusion holds both sides honestly. The store's strongest point is the contested timeline: a credited cleanup account helps its defense, but does not

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automatically defeat either element. Dana's strongest points are the low burden of inspection and the seriousness of floor hazards near self-serve stations.

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The likely teaching outcome is that the case turns on the factfinder's view of the timeline, with comparative fault adjusting any recovery.