Financial investment, nutrition and parental time investment have also shown significant impacts all forms of development (https://www.nominalnews.com/p/early-child-investment-child-t...). Discerning these impacts will always be difficult. Regardless, it appears that external factors do play a more an important role than maybe inherent ones.
Such unionization also has significant spill-over effect on non-unionized workers, which improves their outcomes also (https://www.nominalnews.com/p/unions-strike-action-and-the-e...). It's good to see this shift as it also improves outcomes for consumers.
