How could equal pay affect the economy and poverty rates?

"How important is equal pay? According to the analyses of the 2014–2016 Annual Social and Economic supplement published by the Institute for Women’s Policy Research, the United States economy would have produced additional income of $512.6 billion if women received equal pay; this represents 2.8 percent of 2016 gross domestic product (GDP). In addition, poverty rates would drop from 10.8 percent to 4.4 percent, and the number of children with working mothers living in poverty would be nearly cut in half, dropping from 5.6 million to 3.1 million."