The role of East Java as a trade hub for eastern Indonesia is still in doubt. This study aims to analyze the role of East Java as a trade hub for eastern Indonesia (KTI). This research was conducted descriptively using interregional input-output (IRIO) data with 52 industries in 2016 from BPS. The results of this study show that the proportion of East Java's exports to eastern Indonesia is still small. Although small in proportion, exports by East Java to eastern Indonesia are very profitable for East Java. The value of East Java's exports is greater than the value of its imports. The majority of East Java's exports are used to meet final demand needs. Meanwhile, imports by East Java from eastern Indonesia are dominated by intermediate demand in East Java. Bali is East Java's largest export destination in Eastern Indonesia, followed by Papuan, NTB and NTT. Industries with dominant export values ​​to eastern Indonesia include the Food and Beverage Industry and the Tobacco Processing Industry. Meanwhile, the dominant imports came from a season and annual plantation industry and the metal ore mining industry.

West Nusa Tenggara Province (NTB) has a small economy with a concentration of output to meet needs within its region and has a small proportion of trade outside the NTB region. Leading sectors are needed for faster economic growth. This study aims to describe how the structure of trade and the leading sectors drive economic growth. This research uses the descriptive quantitative method by utilizing interregional input and output data. The results indicate that the output trade structure is mostly traded within the NTB area and the majority is used for final demand. The sector with the largest output value in NTB is still the agricultural sector. However, based on sectoral linkages, the Electricity and Gas Procurement sector has the greatest capacity to encourage the progress of its upstream and downstream sectors. This means that the sector has the potential as a leading sector with the highest economic multiplier and should this sector be encouraged and continued to be spurred to boost economic growth.