Land Reform and Farm Land Rental Market Operation in the Northern Uplands of Vietnam

This paper examines the factors affecting the participation of farm households in farm land rental markets with particular focus on the impact of the land reform. The operational outcomes of such market participation are also analysed. The study used a panel dataset of farm households surveyed before and after the land reform with Random Effect Tobit model. The analysis showed that the land reform have contributed to increased land rental participation. The operation of the market has both efficiency and equity outcomes. Therefore, constraints to functioning of land rental market are difficult to justify. In other words, farm land rental should be promoted to bring such desirable outcomes.land reform, land rental market participation, efficiency and equity in land use, northern uplands.

Land Reform and Rural Households in the Northern Uplands of Vietnam

This paper is the abstract of my doctoral dissertation entitled “The Impact of Land Reform on Rural Households in the Northern Uplands of Vietnam” at the Justus Liebig University of Giessen, Germany under the supervision of Prof. Dr. Siegfried Bauer. The study examined the impact of the recent land reform in Vietnam on the economy of rural households in the Northern Uplands of Vietnam. It was found that the land reform has positive impact on three important aspects of rural household’s economy, namely crop production, land market participation, and afforestation. However, further improvement in terms of private land rights is needed for a more sustainable development in the region.Land reform, panel data, crop production, land markets, afforestation, economic incentives, rural households

Balancing domain decomposition by constraints and perturbation

In this paper, we formulate and analyze a perturbed formulation of the balancing domain decomposition by constraints (BDDC) method. We prove that the perturbed BDDC has the same polylogarithmic bound for the condition number as the standard formulation. Two types of properly scaled zero-order perturbations are considered: one uses a mass matrix, and the other uses a Robin-type boundary condition, i.e, a mass matrix on the interface. With perturbation, the wellposedness of the local Neumann problems and the global coarse problem is automatically guaranteed, and coarse degrees of freedom can be defined only for convergence purposes but not well-posedness. This allows a much simpler implementation as no complicated corner selection algorithm is needed. Minimal coarse spaces using only face or edge constraints can also be considered. They are very useful in extreme scale calculations where the coarse problem is usually the bottleneck that can jeopardize scalability. The perturbation also adds extra robustness as the perturbed formulation works even when the constraints fail to eliminate a small number of subdomain rigid body modes from the standard BDDC space. This is extremely important when solving problems on unstructured meshes partitioned by automatic graph partitioners since arbitrary disconnected subdomains are possible. Numerical results are provided to support the theoretical findings.Peer ReviewedPostprint (published version