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The overall objective of Requirements Engineering is to specify, in asystematic way, a system that satisfies the expectations of its stakeholders.Despite tremendous effort in the field, recent studies demonstrate this isobjective is not always achieved. In this paper, we discuss one particularlychallenging factor to Requirements Engineering projects, namely the change ofrequirements. We proposes a rough discussion of how learning and time explainrequirements changes, how it can be introduced as a key variable in theformulation of the Requirements Engineering Problem, and how this induces costsfor a requirements engineering project. This leads to a new discipline ofrequirements economics.

What If People Learn Requirements Over Time? A Rough Introduction to Requirements Economics