Where does durability collide?

The capacity of a material or structure to resist the physical and chemical processes that wear it down: corrosion, cracking, weathering, fatigue, and chemical attack that accumulate over a service life. Basheer, Kropp, and Cleland's 2001 review Assessment of the durability of concrete from its permeation properties treated durability as how well a material keeps out the water, gases, and ions that drive its deterioration, so that it stays fit for use for its intended lifespan. The referent is a physical property of matter, set by microstructure and exposure, and it is not a good that yields services across market periods or a political order that survives over years.[1]

Unit

One material or structure rated by how long it resists degradation in service

Recovery means

Largely irreversible: decay accumulates, though maintenance, coatings, and repair can slow or partly restore it

Measured by

Assessed by accelerated ageing tests, permeability and porosity assays, and modelled service life under defined exposure

The property of a good that survives use and delivers a stream of services across many time periods rather than being consumed at once, such as a car, a house, or a machine. Bulow's 1982 Durable-goods monopolists showed that because a durable good keeps serving its owner in future periods, a seller effectively competes against the goods it sold earlier, which creates the durable-goods monopoly problem and the time-inconsistency at the heart of the Coase conjecture. The referent is an economic feature of a traded good, defined by its multi-period service flow and its effect on prices and second-hand markets, not the physical toughness of the material it is made from or the survival of a regime.[2]

Unit

One good scaled by how many periods of service it yields before replacement

Recovery means

Not applicable

Measured by

Operationalised through depreciation rates, replacement demand, resale prices, and multi-period service flows in demand models

How long a political regime or institution persists before it breaks down or is replaced, treated in comparative politics as a measurable outcome rather than a property of matter. Geddes, Wright, and Frantz's 2014 Autocratic breakdown and regime transitions built a data set that dates the start and end of regimes so that durability can be studied as survival time and the risk of collapse in any given year. The referent is the staying power of a political arrangement, counted in years of continuity, and it has nothing to do with a material resisting corrosion or a good delivering services across market periods.[3]

Unit

One regime or institution scaled by its years of unbroken continuity

Recovery means

Not applicable

Measured by

Coded as years since the last regime change, and modelled with survival and hazard methods for the risk of breakdown