What argument does the cashier make to encourage a purchase upgrade?

The argument that promotes upgrading a purchase by highlighting that there is only a small price difference effectively addresses a common consumer hesitation: the perceived value for the cost. When consumers weigh their options, they often consider whether the additional expense justifies the benefits. By framing the upgrade as a minor cost increase, the cashier reduces the psychological barrier to spending more, making it seem like a low-risk decision.

This technique relies on the idea of perceived value, suggesting that the added benefit of the upgrade – whether it's additional features, better quality, or increased enjoyment – outweighs the small increase in price. Ultimately, this approach taps into a basic consumer instinct that small additional costs are more acceptable, making it more likely for them to choose the upgrade.