Purpose: This paper aims to examine spillover effects of heterogenous foreign direct investment (FDI) enterprises (domestic vs. export-oriented) through horizontal and vertical linkages and absorptive capacity effect on domestic firms' total factor productivity (TFP). It clarifies the spillover effect on domestic firms in accordance with industrial zones, business size, technology sector and geographical agglomeration, respectively.Design/methodology/approach: The dataset used is based on Vietnamese manufacturing firms during 2011–2014, input–output (I–O) Table 2012. This paper is conducted in two steps: (1) TFP is estimated by using a semi-parametric approach developed by Levinsohn and Petrin (2003); (2) Regression with panel data for domestic firms, applying the fixed effect method.Findings: In terms of domestic-oriented FDI (DFDI) enterprise group: TFP spillover through horizontal linkages is found negative for domestic firms but positive for those participating in export. Additionally, backward linkages have a negative impact on TFP for most domestic enterprises, except for those operating in the high-tech sector. In terms of export-oriented FDI (EFDI) enterprise group, horizontal linkages have a negative impact on domestic firms' TFP including domestic ones participating in export whereas backward linkage is an important channel with positive effects. Absorptive capacity enables firms to improve productivity through linkages with EFDI and DFDI enterprises. Exporters located in industrial zones or regions with numerous exporters can receive better impacts through backward linkages EFDI.Originality/value: Comprehensively, this is the first paper to detect FDI heterogeneity in their behavior when entering a developing country like Vietnam. The added value in this study comes from the export ability of local firms which is in line with Melitz (2003) theory that they can excel in absorping the TFP spillover from competing with DFDI competitors or from supplying to EFDI enterprises. Moreover, the role of small and medium-sized enterprises (SMEs), low technology, high technology and learning by regions affecting the impact through both horizontal and vertical linkages are included for analysis.

Purpose: In the context of the contemporary globalized environment and the rapid progression of Industry 4.0, the existing literature suggests that national intellectual capital does play a significant role in shaping diverse economic metrics. However, the connection between national intellectual capital and total factor productivity (TFP) has been largely overlooked. This paper examines the effect of national intellectual capital on productivity across 84 countries, encompassing diverse income levels, human development index (HDI) levels and continents. Design/methodology/approach: This study utilizes dynamic ordinary least squares (DOLS), fully modified ordinary least squares (FMOLS), two-stage least squares (2SLS), generalized method of moments (GMM) and pooled mean group (PMG) estimation techniques on a sample of 84 economies from 2000 to 2019. Findings: The results reveal a significant effect of national intellectual capital on productivity. Countries with robust intellectual capital exhibit enhanced productivity and, by extension, sustainable economic growth. The findings are nuanced, illustrating varied impacts across low, middle and high-income countries and offering insights into tailored strategies for each income group. Nations with lower HDI levels derive significant benefits from investments in intellectual capital, whereas higher HDI countries experience lower returns in productivity gains from additional intellectual capital investments. Interestingly, Latin America exhibits a paradoxical negative effect of national intellectual capital on TFP. Practical implications: This paper makes a significant contribution to the literature by extending the discourse on intellectual capital to the national level, an area that has been relatively underexplored. The comparative analysis across income groups, human development index levels and continents enriches the understanding of the multifaceted impacts of intellectual capital on productivity. These insights are valuable for policymakers, researchers and international development agencies, providing a comprehensive perspective on how intellectual capital influences productivity in diverse economic and developmental contexts. Originality/value: To the best of our knowledge, this is the first empirical study to investigate the impact of national intellectual capital on productivity across 84 countries, considering diverse income levels, HDI levels and continents.

We examine the impact of foreign direct investment (FDI) on the productivity of Vietnamese domestic firms, using annual enterprise survey data from 2009 to 2018, which cover approximately 300,000 firm–year observations. We estimate total factor productivity with the Levinsohn–Petrin method and relate it to lagged horizontal and backward foreign presence constructed from input–output linkages. Spillovers are examined by FDI origin (Association of Southeast Asian Nations; Japan; People’s Republic of China; and Taipei, China) and by firm characteristics, including size, export status, technology intensity, and absorptive capacity. We find little evidence of productivity gains from horizontal exposure, but robust positive backward-linkage spillovers, strongest for Japanese and Chinese investors. Effects are larger for small- and medium-sized enterprises and for firms with stronger absorptive capacity or greater trade engagement. Governance conditions also moderate spillover strength, underscoring origin-specific complementarities and capability upgrading in developing-country production networks.

This paper examines spillover effects of foreign direct investment (FDI) through horizontal, backward, and forward linkages, and how these spillovers are driven by the exporting ability for Vietnamese manufacturing enterprises. Those participating in export activity can increase the spillover absorption from FDI through the horizontal and backward linkages although local firms are less likely to take advantage of productivity spillovers during this period. In addition, these exporting firms confront the productivity protection of the FDI firms in the same industries. In contrast, the higher their exportability is, the better their learning from the foreign firms in the same downstream sectors becomes. The findings of this paper provide valuable evidence and implications for policymakers in managing and enhancing export ability for firms in the emerging market.