Xinhua world economic news summary at 0900 GMT, May 4

TUNIS -- Tunisian Prime Minister Ahmed Hachani urged Tunisian and foreign economic operators to invest in economic zones to boost the country's economic growth and sustainable development, the Tunis Afrique Presse reported on Friday.

He made the appeal at a small cabinet meeting, during which the issue of royalties for the use of the Zarzis economic zone and the Bizerte economic zone was discussed, said the repo