The retail price index (RPI), which includes mortgage interest payments and is used for many pay negotiations, fell further into deflation.It dropped to -1.2% last month, from -0.4% in March.

• 包括按揭利息支出的零售物价指数(RPI)进一步下跌到通货紧缩水平，四月份RPI从上个月-0.；4%25下降到-1