Dollar metric

In lvl 3 Reading 36, EOC 17, the question refers to “dollar metric”? What is this and where does this term come from?!

I searched the entire book for the term and search yield only one result.

I’d be more than happy if someone could enlighten me on this term and why a new term shows up for the first time in the EOCs.

All they’re asking is what’s the difference between showing your results as percentages of the original investment (return metric) and showing your results as dollars (dollar metric).