Tamara comments to her partner that their neighbor, sam, must be a welfare cheat because sam receives food stamps but just purchased a new smartphone. tamara's comment illustrates an example of

Cognitive prejudice

Explanation:

Here, in this particular case the comment made by Tamara tends to denote the cognitive prejudice. Cognitive Prejudice is referred to as what an individual believe is legitimate and true.Here, the comment made on Sam is true since he receives food stamps but has recently bought a smartphone. Food stamps are mostly received by those who tend to be poor and have significantly less income.  

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