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The paper aims to propose a modified multi‐activity data envelopment analysis (MDEA) to provide information on the efficiency performance of farmers' cooperatives with inputs shared among several closely‐related activities.

The directional distance functions are used to construct a non‐radial measure of performance in which the optimal input/output adjustment and the optimal allocation of shared inputs is simultaneously taken into consideration. The model is applied to study the case of 201 farmers' cooperatives in Taiwan.

The empirical results suggest that there exist significant discrepancy in terms of the performance among the four departments of the farmers' cooperatives. Furthermore, the wide discrepancy in the returns to scale warrant further deregulations by easing restrictions on their consolidation with other cooperatives to operate over broader geographical areas.

An empirical study on Taiwan's farmers' cooperatives is used to demonstrate its applicability and how they can effectively allocate their fixed resources in a multi‐activity environment. Such a measure can be used for rewarding the individual groups of an organization based on their relative contributions to the overall performance.

As the complexity and uncertainty of infrastructural megaprojects challenge traditional management models, there is an increasing focus on value co-creation as an organizational strategy to streamline management. However, the role of value co-creation behavior in facilitating the value realization process remains underexplored. This study examines how justice perception (distributive, procedural and interactional justice) improves contractor value co-creation behavior, focusing on the mediating role of psychological ownership.

Ten hypotheses in the proposed research model were tested through partial least squares structural equation modeling using 199 valid questionnaires from China.

The results show that contractor value co-creation behavior is directly and positively influenced by procedural, distributive and interactional justice and indirectly influenced by them through the underlying psychological mechanism of psychological ownership.

The findings fill a knowledge gap by examining the effect of justice perception on contractor value co-creation behavior based on social exchange theory. Discovering justice perception will contribute to contractor value co-creation behavior, and psychological ownership mediates this relationship.