Employing more women brings a stock market boost, according to Morgan Stanley research on how diversity influences share prices.

Annual returns for businesses that employ the highest proportion of women were 2.8 percentage points above those for the least diverse firms over the past eight years, the report said.

This outperformance was a global phenomenon that was seen despite big differences in gender equality between regions such as Europe, with nearly a third of board seats taken by women in May 2019, and Japan, with just 5 percent.