The economic outlook has deteriorated in all parts of the world over the summer due to an escalating trade dispute between the United States and China, a survey showed on Monday.

Germany's Ifo economic institute said its quarterly survey among nearly 1,200 experts in more than 110 countries showed that its measures for current conditions and economic expectations have both worsened in the third quarter.

"The experts expect significantly weaker growth in world trade," Ifo President Clemens Fuest said, adding that trade expectations hit the lowest since the beginning of the tariff conflict last year.

"Respondents also expect weaker private consumption, lower investment activity, and declining short- and long-term interest rates."