Great Schools
“How important is school size?”
https://www.greatschools.org/gk/articles/school-size/
“In the 1960s the general thinking was that larger schools offered more comprehensive instructional programs of greater quality at lower costs than small schools (generally defined as schools of less than 400 to 500 students at the high school level) did. But in recent years researchers have discovered that the cost savings provided by large schools have had a negative effect on student achievement and graduation rates. As schools get bigger, student achievement declines and larger schools have higher rates of absenteeism, dropouts and discipline problems. In addition, “Dollars and Sense II,” a 2005 study of 25 different small schools across the nation found that, on average, small schools spent 17 percent less per student than comparable schools in their districts while achieving equivalent or better results.”