Sliding scale
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A sliding scale is a scale (usually a payment scale) the values of which depend on another related factor. For example, medical fees may depend on a patient's income. Andrew Carnegie imposed this on his workers during the Pullman Strike.
examples: in school, they would say that 100% on a test was not the standard for an A (10 under a B, 10 under that a C)..but rather the highest score in the class (regardless of what it was) was an A and then 10 under that was a B, and then 10 under that was a C
in reading scripts: if you read a "pretty good" script, at the beginning, you may give it a 5...based on 10 being REALLY good...but if you read 10 crap scripts, and then the pretty good script, you may give it a 10 because the average of the scripts was so poor, hence the use of the phrase "sliding scale" cause you slid the average around to accommodate the selected sample
this also works in nightclubs...where someone can be considered cute/hot/9.5 simply because the environmental average of people in the room is pretty poor...but get that same person in another situation (or out in the light) and they would then be held up against a different scale and as such rate a 4 or 5