Also known as: microbalancing · micro balance · balancing test
Written by attorneys · grounded in primary & secondary sources — see below
A targeted risk-utility analysis in design defect litigation that examines whether the added costs of a particular alternative design would have been justified by the resulting safety gains.
Ming Ma bought a sedan from Meridian Motors and suffered injuries in a collision. She argued that installing a particular proximity sensor would have avoided the crash. The court applied micro-balancing to weigh the sensor's added production cost and any loss in vehicle utility against the specific safety improvement it would have provided in that design.
Monica Morgan purchased a pickup from Marathon Logistics and was injured when the brakes failed on a steep grade. She contended that a cable-linkage brake design would have prevented the failure. The court used micro-balancing to assess whether the marginal expense and reduced performance of that specific brake change would have been offset by the safety benefit.
Mohan Malhotra was hurt when his SUV rolled over and the roof crushed inward. He alleged that thicker roof pillars would have reduced his injuries. The court performed micro-balancing to decide if the increased material cost and slight reduction in headroom justified the safety gain from that precise design alteration.
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Marco Marquez lost part of his foot when a lawnmower blade threw debris. He claimed that a reinforced guard would have contained the blade. The court applied micro-balancing to compare the guard's added manufacturing cost and any effect on cutting efficiency against the safety benefit of that particular feature.
Melissa Mills was injured when the compression rod in her car failed during a routine drive. She proved that a cable-linkage system would have avoided the failure. The court conducted micro-balancing to determine whether the extra cost of the alternative system was worth the safety improvement in that specific component.
Musa Mensah suffered burns when a flexible gas hose ruptured. He showed that a different reinforcement method would have prevented the rupture. The court used micro-balancing to evaluate whether the added expense and any change in hose flexibility of that particular design feature would have produced a net safety gain.
Micro-balancing focuses narrowly on the marginal costs and benefits of one specific design feature the plaintiff claims should have been adopted. Broader analysis might consider the product as a whole or overall social utility without isolating that single change.
The plaintiff must identify a particular alternative design and demonstrate that the increased costs of that change would have been worth the resulting safety benefits in the specific component at issue.
Macro-balancing risks weighing the entire product against abstract social values and can dilute focus on the actual design choice that allegedly caused harm. Micro-balancing keeps the inquiry on the concrete costs and benefits of the precise feature the plaintiff challenges.
Yes. The analysis incorporates feasibility because the cost side of the balance includes only those changes that were technologically and economically practicable when the product was made.
…Eng'g Co. , 20 Cal 3d 413, 418, 573 P2d 443; Prosser and Keeton, op. cit. , § 96, at 689), the reality is that the risk/utility balancing test is a "negligence-inspired" approach, since it invites the parties to adduce proof about the manufacturer's choices and ultimately requires the fact finder to make "a judgment about [the…