The Effects of Temporal Distance on Intra-Firm Communication: Evidence from Daylight Savings Time

Cross-border communication costs have plummeted and enabled the global distribution of work, but frictions attributable to distance persist. We estimate the causal effects of temporal distance stemming from time zone differences on intra-firm communication. We argue that temporal distance reduces synchronous and impromptu communication from first-best levels, and presents an especially costly friction for knowledge-intensive work. Exploiting detailed data from a large multinational firm and discrete changes in temporal distance due to shifts to and from Daylight Savings Time, we show that office pairs that lose one or two shared business hours due to DST reduce their total communication volumes by 9.2 percent on average from baseline levels, an effect driven by decreases in scheduled calls and meetings (-10.7 percent) and in instant-message chat volumes (-8.7 percent). When office pairs gain one or two shared business hours, volumes of unscheduled calls increase (+17.6 percent). Volumes of asynchronous communication (e-mail), in contrast, show no significant responses to changes in temporal distance. Examining heterogeneity by employee function, we find evidence that the shadow value of additional shared time is higher for knowledge-intensive (R&D and IT) employees than for production employees. Finally, using communication time stamps, we show that greater temporal distance leads to more work being shifted into leisure time; however, such adjustments do not fully offset lost communication during business hours. We discuss the implications of our findings for distributed work and for firms’ spatial organization.