Why Default Nudges Work: Identifying Cognitive Mechanism with fMRI

Junichi Chikazoe, Kohei Kawaguchi, Kanji Suzuki, Kosuke Uetake, Yasutora Watanabe and Katsunori Yamada

No wfrsp_v1, SocArXiv from Center for Open Science

Abstract: Default nudges are widely used and effective, but their mechanisms remain unclear. We test whether ease, endowment, or endorsement effects drive choices. In an online randomized experiment, the endowment channel emerges as the principal driver. We then use a novel fMRI approach that constructs brain activity maps of cognitions and uses them to trace their variation in each cognition during decision-making. This approach validates treatments by confirming they elicit the intended cognitions and uses them as instruments to identify the causal effect of cognition on choice. Results show that endowment drives default nudge effectiveness, suggesting policy designs should leverage it.

Date: 2025-09-01
New Economics Papers: this item is included in nep-dcm, nep-exp and nep-nud
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Persistent link: https://EconPapers.repec.org/RePEc:osf:socarx:wfrsp_v1

DOI: 10.31219/osf.io/wfrsp_v1

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