(Bloomberg) — A decision by Japan’s $1.8 trillion pension fund, the world’s biggest, to consider a shift into impact investing has triggered a wider adjustment among the country’s money managers. The Government Pension Investment Fund opened the door to impact strategies in March and at least four other Japanese pension funds are updating or revising their investment policies, according to a review of the funds’ investment policies. At the same time, there’s evidence that asset managers pitching for pensi ...