An increase in Americans living middle-class lifestyles
Explanation:
Being able to credit loans and to have money safe in bank accounts made it possible for people with less present income to save up and buy houses and cars and eventually lead a life that was promised to the middle class of USA in the 20's.
Introduction of credit allowed for the poor to be able to save up money and then get better credit in return .
They could invest more money in houses and other form of immovable property using their money which was compounding interests in the banks for them.
