What this article is saying is that a group of companies in Maine are going to contribute money to a fund that is meant to increase access to and improve the quality of early childhood education in Maine.
The article emphasizes that early childhood education is a good investment in human capital. It talks about how every dollar invested in early childhood education is more than paid back in economic development in the future. This is because (the article implies) so much of a child's brain development occurs before the child reaches kindergarten.
Because early childhood education is seen as a good way to help the state's economy in the long run, these businesses are going to invest in it as a way of investing in their own future.