The mass of unemployed, underemployed, and precariously employed workers that capital maintains as a necessary component of the accumulation processânot despite high productivity but because of it. This relative surplus population serves as a discipline mechanism: the mere existence of those desperate for work suppresses wage demands and workplace militancy among the employed under the constant threat of replacement by "someone whoâd be grateful for the job." Comprising the floating (cyclically unemployed), latent (agricultural/technologically displaced), and stagnant (chronically marginalized) layers, it swells during crises and contracts during booms, yet never fully disappears because capitalism requires this biological lever to keep wages below the level that would threaten surplus value.
Example / Metaphor
Like a permanent waiting room outside the factory gates filled with hungry applicants. The boss never intends to hire them all; their presence is a "threat display" that makes the workers inside accept speed-ups and stagnant pay without complaint. Uber and DoorDash drivers waiting for surge pricing function as a digital version of this army, pressing down on taxi and delivery wages even when they earn less than minimum wage themselves.
Key Reading
Marx, Capital, Vol. I, Ch. 25 ("The General Law of Capitalist Accumulation")