The steady growth of online shopping in the last decades has led to an impact on personal travel and on freight transport that is yet to be fully grasped. Previous research on the subject offers mixed findings, with several studies pointing to complementarity between online and in-store shopping, while others suggest substitution, modification, or neutrality. Using data from a 7-day shopping survey in Lisbon, Portugal, which involved 400 respondents, this paper applies structural equation modeling to explore the relationships among online shopping and in-store shopping preferences, while also considering the period of the week in which the purchases took place, since it is expected that the interaction between shopping and other personal travel behavior varies between weekdays and weekends. The result shows that online shopping preference leads to more online purchases, while in-store shopping preference leads to more in-store purchases. Furthermore, online shopping on weekdays has a positive association with both online and in-store shopping on weekends, which supports a complementarity effect. This effect is linked to a younger population, which commutes by car, and lives in less central areas. Since deliveries are becoming increasingly faster, while living centrally is becoming progressively more difficult, complementarity might give way to substitution, with the foreseeable challenges to maintaining street vitality, if this issue is not addressed timely by policymakers.

在过去的几十年中，在线购物的稳定增长已导致对个人旅行和货运的影响尚待充分掌握。先前关于该主题的研究提供了混合的发现，其中有一些研究指出在线购物与店内购物之间的互补性，而另一些研究则提出替代，修改或中立性。利用葡萄牙里斯本进行的为期7天的购物调查（涉及400位受访者）的数据，本文运用结构方程模型来探索在线购物与店内购物偏好之间的关系，同时还考虑了一周中的购买发生了，因为预计购物与其他个人旅行行为之间的相互作用在工作日和周末之间会有所不同。结果表明，在线购物偏好会导致更多的在线购买，而店内购物偏好会导致更多的店内购买。此外，工作日的在线购物与周末的在线和实体店购物都具有正相关关系，这支持了互补效应。这种影响与人口稀少，驾车上下班，居住在中部地区无关。由于交付速度越来越快，而集中式生活越来越困难，因此，如果政策制定者不能及时解决这一问题，互补性可能会取代替代品，并带来维持街头活力的可预见挑战。工作日的在线购物与周末的在线购物和实体店购物都具有正相关关系，这起到了互补作用。这种影响与人口稀少，驾车上下班，居住在中部地区无关。由于交付速度越来越快，而集中式生活越来越困难，如果政策制定者不能及时解决这一问题，那么互补性可能会被替代，而保持街道活力的可预见挑战也将随之而来。工作日的在线购物与周末的在线购物和实体店购物都具有正相关关系，这起到了互补作用。这种影响与人口稀少，驾车上下班，居住在中部地区无关。由于交付速度越来越快，而集中式生活越来越困难，如果政策制定者不能及时解决这一问题，那么互补性可能会被替代，而保持街道活力的可预见挑战也将随之而来。