Where does deflation collide?

A sustained decline in the general level of prices across an economy, so that a unit of money buys more over time, the mirror image of inflation. It is distinct from disinflation, which is only a slowdown in how fast prices are still rising, and it can feed on itself: Fisher's 1933 The Debt-Deflation Theory of Great Depressions argued that falling prices raise the real burden of fixed debts, forcing distress selling that pushes prices down further in a deflationary spiral. Here the referent is a measurable macroeconomic process, a negative rate of change in a price index, and it has nothing to do with a claim about the word true or with wind stripping sand from a desert.[1]

Unit

A negative rate of change in a broad price index, in percent per year

Recovery means

Reversed by reflation, when monetary or fiscal expansion lifts the price level back up

Measured by

Read as a negative change in a price index such as the consumer price index or the GDP deflator across successive periods

The family of positions holding that being true is not a deep or substantive property of statements, so that to call a statement true is to do no more than assert the statement itself: saying "snow is white is true" says nothing beyond "snow is white". Ramsey's 1927 Facts and Propositions gave the founding redundancy version, and later minimalist accounts such as Horwich's treat the word true as a mere device for asserting and generalising rather than as the name of a rich underlying nature. The label deflationary is later extended to parallel treatments of other concepts, but here the referent is a thesis in the theory of meaning and truth, argued not measured, and it shares only its spelling with falling prices or with wind erosion.[2]

Unit

A philosophical position about the concept of truth, not a quantity

Recovery means

Not applicable

Measured by

Weighed by philosophical argument over whether the truth predicate expresses a substantive property or only serves assertion and generalisation

The erosion process in which wind lifts and carries away loose, dry, unconsolidated particles of sand and silt from a land surface, lowering it and leaving the coarser material behind. Bagnold's 1941 The Physics of Blown Sand and Desert Dunes set out the physics of how wind entrains and transports these grains, and the process carves hollows and blowouts and concentrates a stony lag that armours the ground, the desert pavement whose origin McFadden, Wells, and Jercinovich studied in 1987. Here the referent is a physical stripping of sediment by air, mapped and measured on the ground, and it is unrelated to a drop in prices or to a claim about the word true.[3][4]

Unit

A lowered land surface, gauged by the depth or volume of material the wind has stripped away

Recovery means

The surface can stabilise when a coarse stone lag, a desert pavement, or vegetation shields the remaining particles from the wind

Measured by

Estimated from the volume of sediment removed, the depth of deflation hollows, and the coarse lag the wind leaves behind