The Value of Patience in Online Grocery Shopping

TL;DR

This study shows that increasing customer patience by a few minutes in online grocery delivery can significantly reduce traffic congestion and emissions, balancing convenience with societal benefits.

Contribution

It introduces a mathematical model linking customer patience to traffic congestion and validates it with large-scale data analysis, revealing substantial environmental benefits from modest patience increases.

Findings

Five additional minutes of delivery patience reduces daily mileage by 30%.

A 20% reduction in CO2 emissions is achieved with increased patience.

Marginal benefits diminish beyond ten minutes of added patience.

Abstract

Since the COVID-19 pandemic, online grocery shopping has rapidly reshaped consumer behavior worldwide, fueled by ever-faster delivery promises aimed at maximizing convenience. Yet, this growth has also substantially increased urban traffic congestion, emissions, and pollution. Despite extensive research on urban delivery optimization, little is known about the trade-off between individual convenience and these societal costs. In this study, we investigate the value of marginal extensions in delivery times, termed customer patience, in mitigating the traffic burden caused by grocery deliveries. We first conceptualize the problem and present a mathematical model that highlights a convex relationship between patience and traffic congestion. The theoretical predictions are confirmed by an extensive, network-science based analysis leveraging two large-scale datasets encompassing over 8 million grocery orders in Dubai. Our findings reveal that allowing just five additional minutes in delivery time reduces daily delivery mileage by approximately 30 percent and life-cycle CO2 emissions by 20 percent. Beyond ten minutes of added patience, however, marginal benefits diminish significantly. These results highlight that modest increases in consumer patience can deliver substantial gains in traffic reduction and sustainability, offering a scalable strategy to balance individual convenience with societal welfare in urban delivery systems.