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A replacement bearing might cost a few hundred dollars. The production line it sits inside can cost $600 a second when it stops. That gap, between the price of a part and the price of its absence, is where manufacturers quietly lose fortunes.
Downtime Costs the World's 500 Biggest Companies $1.4 Trillion a Year
Unplanned downtime drains about $1.4 trillion a year from the world's 500 largest companies, equal to 11% of their combined revenue, according to Siemens' True Cost of Downtime 2024. Siemens puts that total near the annual GDP of Spain. It has climbed from $864 billion across 2019 and 2020, a rise of roughly 62% in five years, even as the number of incidents fell.
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One Missing Component Runs Into the Millions
The per-hour figures explain the anomaly. In automotive plants, an idle line costs $2.3 million an hour, or more than $600 a second, Siemens found. At that rate, the value of a $500 part evaporates in under a second of stoppage. Most of that cost sits downstream of the part: lost output, plus the emergency premiums to get running again.
Recovery has also slowed. The average plant now takes 81 minutes to restart after a stoppage, up from 49 minutes in 2019, as thinner maintenance staffing and stretched supply chains make emergency parts slower to source.
Parts and Shipping Are Driving the Bill Higher
Ask maintenance leaders what changed, and the answer points to the supply room. In a 2024 State of Industrial Maintenance survey, 72% of maintenance and operations professionals tied rising downtime costs to the rising cost of parts and shipping. A 2025 report from L2L found material shortages increasingly named among the causes of unplanned stoppages, while 67% of manufacturers still run reactive maintenance, fixing components after they fail rather than before.
When a part is not on the shelf, the math turns punishing. Expedited and emergency parts can run 150% to 300% of standard pricing, one industry analysis estimated, before a single hour of lost production is counted.
The Cheapest Fix Is Knowing What's on the Shelf
The defense is unglamorous: spare-parts and MRO inventory discipline. That means a live count of the components that can stop a line, with reorder points and low-stock alerts set on each. Parts inventory software handles that tracking, flagging low stock and triggering purchase orders on the bearings and seals a plant cannot run without, so a $500 gap never turns into a six-figure one.
The stakes scale down as well as up. Aberdeen Research puts the average cost of unplanned downtime near $260,000 an hour across manufacturing, and Deloitte has long estimated the annual toll on industrial manufacturers at roughly $50 billion. For a small plant on thin margins, a single avoided stoppage can cover the cost of the system that prevented it.
Lean Production Made Every Idle Hour More Expensive
The trend behind the trillion-dollar figure is structural. Manufacturers have cut inventory buffers and tightened just-in-time schedules for two decades, which trimmed carrying costs but left less slack when a line goes down.Â
Siemens notes that incidents have grown less frequent while the cost of each one has risen, a sign that leaner operations feel every disruption more sharply.Â
As predictive maintenance and inventory tracking move from competitive edge to baseline expectation, the plants treating a stray bearing as a financial risk, not a stockroom afterthought, are the ones staying ahead of the number.
