Originally Posted by aculady
I'll point out that the SAT uses a definition of "low income" that is perhaps overly broad for accurately assessing the impact of poverty on achievement: they define "low income" as having a family income less than $30,000/year, and that limits its usefulness.

My rural-ish psychiatrist brother-in-law uses $40,000/year as his informal cutoff below which he expects an increase in psychological problems due to lack of money.