In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
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Question: Marginal utility is a concept from economics that describes the change in utility from consuming more or less of a good or service .

Answer: In economics , utility is the satisfaction or benefit derived by consuming a product ; thus the marginal utility of a goods or service is the change in the utility from an increase in the consumption of that good or service .

Question: The iPad Air is 7.5 millimeters thick , which is thinner than both the iPad 2 and the iPad Mini .

Answer: The iPad Air marks the first major design change for the iPad since the iPad 2 ; it now has a thinner design that is 7.5 millimeters thick and has a smaller screen bezel similar to the iPad Mini .

Question: He placed 53 songs on the " Billboard " Hot 100 , and its predecessors , between 1957 and 1973 , including " Poor Little Fool " in 1958 .

Answer:
He placed 53 songs on the " Billboard " Hot 100 , and its predecessors , between 1957 and 1973 , including " Poor Little Fool " in 1958 , which was the first # 1 song on " Billboard " magazine 's then-newly created Hot 100 chart .