Did Lydia make an all-or-nothing or a marginal decision while spending her money? Justify your response.

Lydia made a marginal decision because she is trying to save for her collage by spending less, she will have some money left over after paying for her necessary to go to her college tuition.

Explanation:

She saved part of it for her college tuition and spent the remainder for the prom dress, car insurance, and birthday gift.