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system
economics: negative consumer sentiment following failure to upsell
user
there are several different participants in the transaction, and you may not be aware of all the issues: in some business (fast food) they are required to ask if you want to super size, they are expected to do this at every transaction, but aren't paid more if you buy more. the employee can also decide that too much pressure to up-sell may push you to purchase the item online. that will cost them a commission, the store location a sale, and maybe drive you to a different company. it is also possible they don't have the training to be able to explain the difference between the items.
assistant