One of the world’s richest regions has some of its starkest divides, with its top 10% of households holding two-thirds of its wealth, according to a new study of Santa Clara and San Mateo counties.

Read More 6

Congress outlawed tax deductions on “wash sales” in 1921, but Goldman Sachs and others have helped billionaires like Silicon Valley's Mark Zuckerberg, Brian Acton and Dustin Moskovitz see huge tax savings by selling stocks for a loss and then replacing them with nearly identical investments.

Read More 3