The study analyzes in Spain the relationship between fecundity and marriage. In order to analyze how marriage and fertility are interrelated variables over time empirically evaluated a model that attempts to capture the non-causal temporal relationships between both phenomena in Spain. The analysis is approached by a VAR model and impulse response functions. The data used comes from the National Statistics Institute (INE). It has proven a fluctuating relationship between the two processes and weakly procyclical. The performances on births generate effects on both series showing influence-leadership.

Keywords: Fertility, marriage, vector autoregressive models, Spain