Why economics belongs here

The word “economics” in a conversation about love raises an understandable suspicion. It is usually expected to bring an attempt to put a price on people, turn marriage into an exchange of services and explain every action by self-interest. Economics is more interesting than its caricature: its basic material is decisions under constraints. Time is limited, information is incomplete, the future is unknown, refusal has consequences, and one person’s choice changes another’s options. Relationships supply all these conditions generously. Search theory asks how many options are worth examining before you stop; game theory, how today’s act will change the partner’s answer tomorrow; signalling theory, which promises carry information; contract theory, how to agree about events that cannot be listed in advance; bargaining models, why people who love equally can hold unequal power.

Studies differ not only in their answers but in the questions their design can bear. A snapshot of one group at one moment shows an association but does not report what caused what. Following the same people over time recovers the order of events, but preserves the hidden differences between them. Random assignment and natural experiments do better at separating a causal effect; a meta-analysis reduces random noise but inherits the limitations of the original work. A figure has to be read together with the observation setup: who ended up in the sample, what was measured, what it was compared with, and which alternative explanation was left open.