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How activating arm muscles while using shopping carts affects purchasing:
According to research on Arm Posture and Product Choice by Mathias C. Streicher and Zachary Estes, bringing the forearm toward the upper arm like when lifting a basket activated biceps which is associated with positive evaluations, attaining gains and increased the number of products purchased. A slightly lower parallel handle than the standard horizontal or perpendicular bar on a shopping cart increased the purchase quantity, spending, variety and increased the choice of vices (e.g. chocolate bars) over virtues (e.g. fruits) likely due to movement of biceps symbolising bringing objects like food towards the body.
Copy of this paper by Estes, Z. & Streicher, M. C. (2022); Courtesy City, University of London, City Research Online (CRO), institutional repository.