Pre-school an investment for life
The children were randomly assigned into a control group that did not attend pre-school and a treatment group that received high quality pre-schooling at ages three and four.
These two groups were then observed at the age of 40. The study found that 60% of the children receiving the high quality pre-school care and education earned $20,000 or more by age 40 compared to just 40% of the control group.




