noun
transit trade
Trade in which goods pass through a country en route to another destination, without being processed or consumed locally.
シンガポールは通過貿易の拠点として知られている。
Singapore is known as a hub for transit trade.
中継貿易 is a broader term for intermediary trade, which may include re-export after processing, while 通過貿易 specifically refers to goods merely passing through without alteration.
Compound of 通過 (passage, transit) and 貿易 (trade).