2008年-世界发展银行全球_Rising_Food_Prices_in_Sub-Saharan_Africa___Poverty_Impact_and_Policy_Responses_28页_297kb

Rising Food Prices in Sub-Saharan Africa: Poverty Impact and Policy Responses

Core Content

This policy research paper explores the impact of rising food prices on poverty in sub-Saharan Africa and evaluates the effectiveness of policy responses. The authors, Quentin Wodon and Hassan Zaman, analyze how higher food prices affect different population groups and discuss the implications of various policy interventions.

Main Viewpoints

• Rising Food Prices and Poverty: Higher food prices tend to increase poverty in sub-Saharan Africa because the negative impact on net poor consumers outweighs the benefits to poor producers.
• Policy Responses: Three main types of policy responses are identified:
  1. Economy-wide policies to stabilize domestic food prices.
  2. Social protection programs to cushion the poor from price increases.
  3. Policies to boost domestic food production to address long-term food security.
• Regional Differences: Sub-Saharan African countries primarily use reducing import tariffs on staples, while other regions often implement price controls or targeted subsidies.
• Social Protection Programs: These are more prevalent in sub-Saharan Africa and are being scaled up. However, geographic targeting is essential to ensure benefits reach the neediest.
• Focus on Rural Areas: Despite the adverse effects on urban poor, the authors emphasize that anti-poverty interventions should continue to focus on rural areas where poverty remains highest.

Key Information

Distributional Impact of Price Increases

• The net consumption ratio is used to assess how households are affected by food price changes.
• Deaton's framework calculates the welfare impact of price changes using the formula:

$$
\Delta w _ {i} = \Delta p \left[ \left(PR _ {i} - CR _ {i}\right) + \eta L _ {i} \right]
$$

Where:

• $\Delta w_i$: Welfare effect for household $i$
• $\Delta p$: Percentage change in food prices
• $PR_i$: Food production ratio
• $CR_i$: Food expenditure ratio
• $\eta$: Wage elasticity with respect to food price changes
• $L$: Labor share in household income or consumption

Short-Run vs. Long-Run Impacts

• In the short run, the rural poor are adversely affected due to limited ability to adjust production and consumption.
• In the long run, wage adjustments may neutralize some of the negative effects, but this is not always the case, especially in sub-Saharan Africa.
• Households may respond to price shocks by selling productive assets, which can aggravate chronic poverty.

Poverty Headcount Impacts

• A 10% increase in food prices can raise the poverty headcount ratio by 0.4 percentage points on average.
• A 50% increase in food prices leads to:
  • Upper bound estimates (only consumer impact): 4.4 percentage points increase in poverty headcount in rural areas, 5.2 in urban.
  • Lower bound estimates (including producer gains): 2.2 percentage points in rural areas, 3.7 in urban.
• For sub-Saharan Africa as a whole, a 50% increase in food prices could lead to an increase in poverty of close to 30 million people.

Human Development Impact

• Higher food prices can lead to micro-nutrient deficiencies due to reduced consumption of protein sources.
• Acute malnutrition and reduced calorie intake are significant concerns, especially for children under 24 months, pregnant and lactating women, and those already malnourished.
• The adverse impact on schooling is also documented, with some households reducing education spending to cope with rising food prices.

Country-Specific Findings

• Urban Poor: More vulnerable due to limited ability to adjust wages and higher exposure to price increases.
• Rural Poor: Affected by small landholdings, high input costs, and limited market access.
• West and Central Africa: Showed more significant poverty impacts compared to other regions.
• East Africa: Ethiopia and Somalia are particularly affected due to drought, conflict, and rising prices.
• Uganda: Relatively insulated from global food price rises due to diversified local staple diets.

Methodological Considerations

• The Deaton method is used to estimate the impact of price changes on poverty, but it has limitations.
• Partial equilibrium analysis is used due to limited CGE modeling in sub-Saharan Africa.
• Pass-through rates of global prices to domestic prices are crucial in estimating poverty impacts.
• Assumptions about consumption and production patterns significantly affect the results.

Conclusion

The paper concludes that rising food prices have a substantial negative impact on poverty in sub-Saharan Africa, especially for the urban poor. While reducing import tariffs is a common policy response, it may benefit the non-poor more than the poor. Social protection programs show more promise but require better targeting. The authors stress the importance of focusing on rural areas and improving access to credit to help households avoid distress sales and mitigate the long-term effects of food price shocks.