JAKARTA (Reuters) -Indonesia’s trade surplus likely narrowed to $4 billion in August, as exports shrank while imports remained in contraction, a Reuters poll showed on Tuesday. In July, the surplus was at $4.18 billion, supported by strong shipments of palm oil products and machinery. Southeast Asia’s largest economy has recorded a back-to-back monthly trade surplus since mid-2020, and recently driven by a surge in exports ahead of U.S. tariff implementation. The survey forecast annual headline inflation at 2.5% for September, accelerated slightly from 2.31% in August, while month-to-month inflation was seen at 0.13% versus deflation of 0.08% in August. Annual core inflation, which strips out government-controlled and volatile food prices, was expected at 2.2% in September, compared with 2.17% in August.