Jakarta, June 27 -- At the bustling Port of Tanjung Priok in Jakarta, thousands of shipping containers move seamlessly every day.

Some are loaded onto vessels bound for foreign markets, while others are unloaded carrying raw materials vital to keeping domestic factories humming.

For port workers, the priority is keeping shipments on schedule. For exporters, it is finding buyers. For industrialists, it is ensuring an uninterrupted supply chain.

Yet the smooth movement of these goods is often shaped by decisions made far from the docks.

Trade agreements, tariff adjustments, investment flows, and shifting geopolitical alignments ultimately determine whether a product maintains its market share, whether a local factory gains access to new...