2007年-世界发展银行全球_Land_Tenure_Investment_Incentives_and_the_Choice_of_Techniques_22页_163kb

报告摘要

Summary of "Land Tenure, Investment Incentives, and the Choice of Techniques: Evidence from Nicaragua"

Core Content

This article investigates the relationship between land tenure and the choice of cultivation techniques among farmers in Nicaragua, focusing on the adoption of tree crops versus annual crops. The key finding is that farmers are more likely to grow tree crops on land they own compared to land they rent, even when techniques are observable and contractible.

Main Viewpoints

Land tenure affects agricultural practices: Ownership status significantly influences the choice of cultivation techniques, with tree crops being more common on owner-cultivated plots.
Tree crops are more profitable and beneficial: Tree crops are generally more profitable and contribute to soil conservation, nutrient recycling, and fertility maintenance. However, their adoption is hindered by incentive and commitment issues.
Landlords are reluctant to commit to long-term contracts: The analysis suggests that the reluctance of landlords to offer long-term tenancy contracts is a key reason behind the observed difference in tree cultivation between owners and tenants.
Tenants' wealth is not a significant determinant: Contrary to theories of moral hazard, tenants' wealth does not significantly influence the decision to grow tree crops.
Long-term contracts improve tree cultivation: The probability of growing trees is higher for tenants with long-term contracts, indicating that long-term commitment is crucial for the adoption of tree crops.

Key Information

Sample and Data

The study uses data from the 1998 Nicaragua Living Standards Measurement Study survey, which includes 1,258 households.
Household wealth is a significant factor, with tenants being significantly poorer than owner-cultivators.
Farmers who rent out land are richer than those who do not.
Most farms consist of one or two plots, and no household rents in and out simultaneously.

Dependent Variables

tree_mix: Indicates if the farmer grows at least one tree crop.
tree_mix2: Indicates if the farmer grows at least one coffee or citrus tree with annual crops.
tree_main: Indicates if a tree is a main crop on the plot.

Results

63% of owners grow at least one tree, compared to 49% of tenants.
13% of owners grow trees as a main crop, versus 4% of tenants.
The effect of ownership is statistically significant in all models.
The probability of tree cultivation increases with longer tenancy contracts.
Household size and farmer age are also positively correlated with tree cultivation, while farm size has a negative effect.

Empirical Strategy

Two main approaches are used:
- Fixed-effects model (comparing owned and rented plots of the same farmer).
- Cross-sectional matching (using nearest neighbor matching to estimate the treatment effect of ownership).
The fixed-effects model controls for farmer-specific characteristics.
The cross-sectional model includes household and farmer characteristics, as well as town and province-level variables.

Policy and Legal Context

Land reforms in Nicaragua, particularly after the 1979 Sandinista revolution, have led to unequal land distribution.
Landlords fear reforms and are unwilling to commit to long-term tenancy contracts.
Current land laws grant strong rights to long-term tenants, making eviction difficult and increasing the cost of long-term commitments.

Conclusion

The study highlights that land tenure plays a critical role in shaping cultivation techniques, particularly in the adoption of tree crops. While long-term contracts are important for incentivizing tree cultivation, they are rare in Nicaragua, suggesting a barrier to investment and technique adoption. The findings are consistent with previous research on the relationship between land inequality and agricultural productivity, emphasizing the need for policy reforms that enhance tenure security and contract flexibility to promote sustainable agricultural practices.