Volvo effect
The Volvo effect is a critique of standardized testing in U.S. schools, especially the SAT, that says students from high-income families do better than students from low-income families. The name was coined by Peter Sacks in his 2001 book Standardized Minds. In this, he proposes that schools could estimate student performance on certain styles of standardized tests simply by counting the number of Volvos or comparably expensive cars owned by a student's family.
It been facetiously proposed as an alternative method for measuring school quality and student achievement, particularly when the goal is a norm-referenced ranking instead of a criterion-referenced test.
The original text in which the Volvo effect was advanced said:
Sacks criticized the SAT in particular, for showing a demonstrable difference in the scores achieved by high-income and low-income students. At the time, a typical low-income American student with a family income of $20,000 per year would score about 100 to 350 points less than a typical high-income student with a family income of $90,000 per year.