E. Kotyrlo1 Space-time dynamics of fertility and commuting The study contributes in analytical description of spatial diffusion of fertility, in particular, influenced by labour movements of people between places of residence and work. <...> It is assumed that the labour market has externality on the marriage market due to commuting, which, in turn, affects fertility. <...> A model of spatial diffusion of fertility is based on assumption of global and local spillover effects. <...> The global spillover effect, as shifts in fertility norms, is motivated by increasing variance of social interactions of an individual, when places of work and residence are different. <...> One local spillover effect is in response to flows of earnings across space. <...> The analytical model, in which the effects on fertility of the cited spillovers are decomposed, is constructed in the paper on the base of a model of the demand for children, spatial stock-flow model of a market, and a matching model with a sex imbalance or spatial mismatch as the probability of matching. <...> Three sex imbalances, namely of night-, day-time population and an adjusted to sex imbalance of commuters to residents are empirically tested. <...> However, there are externalities of labour mobility on fertility due to changes of gender structure of population. <...> Keywords: commuting; demand for children; effect of flows of earnings; effect of matching; local spillover effect; spatial diffusion of fertility. <...> Introduction on fertility through differences in wages in the place of residence and work, and the effect of matching through the process of search in the marriage market. <...> This paper extends a previous study (Kotyrlo, 2014), where fertility spatiotemporal dynamics is described. <...> Spillover effects may be motivated by social interactions and, therefore, be related to changes in individual preferences to have children. <...> Social interactions may reduce the uncertainty inherent in a chosen life style by imitating others’ life styles or family norms such as the timing of childbearing (Balbo, Barban, 2012). <...> The spatial diffusion of fertility can also be caused by learning from others (Montgomery, Casterline, 1996). <...> Due to rivalry in pronatalist policy that might affect fertility in a regional context, spillover effects may also arise in the relation 1 Kotyrlo Elena — Umeе University, Sweden; People’s Friendship University of Russia, Moscow, Russia; kotyrlo@mail.ru. 78 Экономика труда Labour <...>