Referring to a short time horizon, usually one in which some aspects of behavior that would vary over a longer time do not have time to do so. In trade models, it usually means that the employment of some factors of production is fixed. Contrasts with long run.
the short period during which supply and demand are relatively fixed.
the period of time during which it is not possible to change all inputs to production; only some inputs, such as labor, can be changed.