World Week Ahead: US data due, Yellen speaks

World Week Ahead: US data due, Yellen speaks
Tina Morrison
By Margreet Dietz   May 23 (BusinessDesk) - The latest US economic data as well as speeches by several Federal Reserve officials including Chair Janet Yellen will form a key focus as investors are coming to terms with the prospect of a US interest rate hike as early as next month.    On Friday, Yellen will speak with Harvard Professor Gregory Mankiw in Massachusetts.    First, other Fed officials will take the stage including St Louis Fed President James Bullard in Beijing, San Francisco Fed's John Williams, and Philadelphia F...