Field Note

A Price Difference Is Not Yet an Explanation

A price difference is an observation. It becomes an explanation only when evidence connects the outcome to an assignment rule, input, or cause.

Aug 4, 20261 min readBy Dalton Anderson

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THE LOYALTY PENALTY: WHY YOUR FAITHFUL SHOPPING HABITS ARE COSTING YOU MORE

Keywords Instacart, Consumer Reports, dynamic pricing, AI, surveillance pricing, Eversight, customer surplus, price discrimination, grocery staples, algorithm ethics SummaryIn this episode of the Venture Step Podcast, Dalton Anderson dives into a recent Consumer Reports investigation regarding Instacart’s use of AI-enabled dynamic pricing. Dalton explores how the technology, powered by a company called Eversight, aims to reduce "customer surplus" by charging users different prices for the exact same goods based on their willingness to pay. The discussion highlights the ethical concerns of applying airline-style pricing logic to essential items like milk and eggs, the manipulation of discount perception, and the potential for discriminatory profiling against vulnerable populations. Takeaways While society generally accepts variable pricing for airline seats due to supply and demand, applying this logic to essential goods like bread and eggs raises significant ethical questions. A Consumer Reports investigation involving 437 volunteers found that 74% of items selected had different prices for different people in the same geographic areas. The study revealed massive markups, such as a 23% increase for Wheat Thins in Seattle and a 20% price swing for eggs in DC. This pricing strategy is driven by "Eversight," which uses AI to determine the maximum price a consumer will pay, effectively eliminating the savings a customer might otherwise enjoy . Additionally, the illusion of deals is created when algorithms artificially inflate the list price for certain users to make a standard discount appear larger. Brand loyalty can also act as a disadvantage; if an algorithm knows you will always buy a specific brand, it may charge you more for it. Ultimately, there are fears this technology could evolve into discriminatory profiling, similar to failed predictive policing models, targeting users based on personal data and location.

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A Price Difference Is Not Yet an Explanation

A price difference is an observation. It becomes an explanation only when evidence connects the outcome to an assignment rule, input, or cause.

That distinction protects both sides of a pricing investigation. It prevents a company from dismissing a documented difference as meaningless, and it prevents a reporter from turning an unexplained output into a claim about surveillance, discrimination, or intent.

The useful sequence is observation, controlled comparison, replication, system evidence, and then causal or legal interpretation.

Sources

Follow the evidence.

ag.ny.gov: attorney general james demands answers instacart about algorithmic pricingag.ny.gov
itl.nist.gov: pri332itl.nist.gov
instacart.com: promotionsinstacart.com
ftc.gov: ftc surveillance pricing study indicates wide range personal data used set individualized consumer pricesftc.gov
consumer.ftc.gov: online shoppingconsumer.ftc.gov
company.instacart.com: instacartpricingcompany.instacart.com
gov.uk: tackling the loyalty penaltygov.uk
company.instacart.com: instacart makes it easier for customers to save on groceries with acquisition of eversightcompany.instacart.com
instacart.com: 1586544648instacart.com
usa.gov: online purchase complaintsusa.gov
company.instacart.com: ending item price tests on instacartcompany.instacart.com
company.instacart.com: the truth about pricing tests on instacartcompany.instacart.com
itl.nist.gov: pri11itl.nist.gov
fca.org.uk: fca confirms measures protect customers loyalty penalty home motor insurance marketsfca.org.uk
consumerreports.org: instacart ai pricing experiment inflating grocery bills a1142182490consumerreports.org
investors.instacart.com: 9e9aff2c 95db 4f75 bdf1 0f4025e1468cinvestors.instacart.com