If there's a feeling that you're undervalued in a company, whether it's in terms of pay, benefits, or some intangible, I think it becomes a creeping red flag. Feelings are the first indicator of something going wrong, and while often times emotions are just emotions, if that cognitive dissonance is persistent then you got yourself a good indication that there's something not right.
As @taghatle
mentioned, you also have more responsibilities! You're doing more than what you originally accepted an offer for, and that alone means you should be paid more, or compensated more somehow.
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If there's a feeling that you're undervalued in a company, whether it's in terms of pay, benefits, or some intangible, I think it becomes a creeping red flag. Feelings are the first indicator of something going wrong, and while often times emotions are just emotions, if that cognitive dissonance is persistent then you got yourself a good indication that there's something not right.
As @taghatle mentioned, you also have more responsibilities! You're doing more than what you originally accepted an offer for, and that alone means you should be paid more, or compensated more somehow.