I am a PhD candidate at Wharton researching consumer behavior. My research focuses on how cognitive biases influence consumer decision making. I aim to answer questions such as:
  • When do consumers overspend on products that improve their chances of attaining their goals?
  • Do charitable donors use cost-effectiveness information to donate more efficiently, or could they use it to donate less efficiently?
  • Why are consumers more sensitive to discounts off of lower prices?
  • ​Does a sales price feel lower relative to a single high list price or a range of high list prices?

​A list of my papers is below, and you can read more about my projects here.​
​My CV is available here. 
You can email me at: lejoshua@wharton.upenn.edu.
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​​Publications
(updated October 2019)

Lewis, Joshua, Celia Gaertig, and Joseph P. Simmons (2019), “Extremeness Aversion Is a Cause of Anchoring,” Psychological Science, 30(2), 159–173. 
 
Lewis, Joshua and Joseph P. Simmons, “Prospective Outcome Bias: Incurring (Unnecessary) Costs to Achieve Outcomes That Are Already Likely,” forthcoming at Journal of Experimental Psychology: General.
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​Working Papers
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Lewis, Joshua and Deborah A. Small, “Ineffective Altruism: Giving Less When Donations Do More Good.”

Lewis, Joshua, Alex Rees-Jones, Uri Simonsohn, and Joseph P. Simmons, “Diminishing Sensitivity to Outcomes: What Prospect Theory Gets Wrong about Diminishing Sensitivity to Price.”

Lewis, Joshua and Joseph P. Simmons, “Anchors Alter the Direction of Adjustment - Not Just the Magnitude.”
  
Green, Etan A. and Joshua Lewis, “The Forgone-Option Fallacy.”

Green, Etan A., Joshua Lewis, and David Rothschild, “Barely Plausible Anchor Values Maximize Bias.”
 
Moore, Alexander, Joshua Lewis, Emma E. Levine, and Maurice E. Schweitzer, “Trusting Kind Friends and Fair Leaders: How Relationships Affect the Antecedents of Trust.”
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