Gross state product would increase by $25 billion over five years if Massachusetts closed its racial divide in wages, housing, investments, and wealth, according to a new report. The business-backed Massachusetts Taxpayers Foundation said its 29-page report marks its first exploration of the issue and statistically documents inequities in wealth, income and employment, education, criminal justice, and health care. If Black and Hispanic residents graduated from college at the same rate as white peers, the report said, Massachusetts would realize $20 billion over a decade in increased tax rev...