This document discusses benefit-cost analysis (BCA) for climate change adaptation policies in agriculture. It explains that BCA is an ex-ante methodology used to efficiently allocate scarce resources by identifying solutions that minimize costs or maximize benefits. The document outlines the basic steps of a BCA, which include specifying alternative projects, identifying impacted groups, quantifying and monetizing impacts over time, discounting values, and calculating net present values. It provides an example of applying BCA to the "Enhancing the Resilience of Agro-ecological Systems" project in Malawi, finding an internal rate of return of 27.5% and a positive net present value.

1. Economics of Adaptation in Agriculture
Benefit-Cost Analysis for Climate Change Adaptation Policies in
Agriculture
Giacomo Branca
Agriculture Economist - Tuscia University, Italy

2. What can you expect from this webinar?
• Understand the logic of Benefit-Cost Analysis (CBA)
• Reflect on the role of CBA in the NAP process
• Learn the steps involved in carrying out a CBA of adaptation options
Outline
1.CBA: what is it?
2.The role of CBA in the NAP process
3.The basic steps of CBA
4.An example: CBA of an agriculture adaptation project in Malawi

3. 1. CBA: what is it? (1/3)
• It is a policy/project assessment method
• The terms policy and project are used
interchangeably here
• CBA applies to policies, programs, projects,
regulations, investments
• Ex-ante methodology to identify efficient
solutions in allocating society’s scare resources
• Efficiency: minimize costs or maximize benefits.
Best use of available resources
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4. 4
• Individuals consider only their own costs and benefits
• On the contrary, CBA considers all costs and benefits to society
as a whole: social costs (C) and social benefits (B)
1. CBA: what is it? (2/3)

5. 1. CBA: what is it? (3/3)
• It monetizes the impact of policy/project to
society
• Aggregate value of a policy/project is: NB=B-C
(net benefits)
• It measures whether the benefits of a
policy/project are bigger than the costs (NB >0)
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6. • Country governments
engaging in NAP process
• Complex task – many
elements
• Decision making tools are
needed
CBA one such tool: rank and prioritize adaptation
options in light of their costs and contribution
to sustainable socioeconomic development
Provides complementary inputs for NAP process:
• International agencies/financiers
require CBA be carried out at project
design
• Useful to unlock funding for Climate
Change adaptation projects (e.g. Green
Climate Fund - GCF)

7. 3. The basic steps of CBA (1/7)
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Table 1 The major steps of CBA
1 Specify the set of alternative projects
2 Decide whose benefits and costs count
3 Identify impact categories and select measurement indicators
4 Predict the impact quantitatively over project life
5 Monetize all impacts
6 Discount benefits and costs to obtain present values
7 Compute the net present value of each alternative
8 Perform sensitivity analysis

8. 3. The basic steps of CBA (2/7)
Step 1
–Specify the set of alternative projects/policy options
–Compare ‘With Project’ (WP) and ‘Without Project’ (WoP)
scenarios
–WoP is the counterfactual (or the baseline)
–CBA compares the Net Benefits of investing resources in one
particular potential project with the baseline
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9. 3. The basic steps of CBA (3/7)
Step 2
•analyst decides whose benefits and costs should be included, i.e.
define the boundaries of the analysis
– issues analysed from a global perspective: global climate change
– issues analysed from a more local perspective: e.g. national
policies
– local/national governments want to consider only costs and
benefits to local/national residents
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10. 3. The basic steps of CBA (4/7)
Step 3
•Identify physical inputs/outputs of the projects: costs&benefits
•Identify cause-and-effect relationship between physical outcome of
the project and the utility of human beings of individuals within the
boundary of analysis
Step 4
•Quantify all impacts in each time period
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11. 3. The basic steps of CBA (5/7)
Step 5
•Monetize each of the impacts.
•Where markets exist and work well, value can be determined from
the appropriate market demand curve. Problems arise where markets
do not exist (e.g. environmental goods) or do not work well (e.g.
developing countries).
•When market prices are no longer a good guide to social costs and
benefits, specific methods can be used to measure such ‘non market’
values .
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12. 3. The basic steps of CBA (6/7)
Step 6
•Future benefits and costs are discounted relative to present benefits
and costs in order to obtain their Present Values (PV).
•This is necessary since it is not possible to compare values which
occur at different points in time.
•A cost or benefit that occurs in year t is converted to its present value
•The PV of the benefits and the costs will be respectively:
– PV(B) = ∑[Bt/(1+s)t
]
– PV(C) = ∑[Ct/(1+s)t
]
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13. 3. The basic steps of CBA (7/7)
Step 7
•Compute Net Present Value (NPV) of each alternative: NPV = PV(B) – PV(C).
– Decision rule : NPV > 0
– Compare mutually exclusive alternatives: select option with the largest
NPV
•An alternative indicator is the B/C ratio, i.e. the ratio of present value benefits
to present value costs.
– B/C > 1  option viable in economic terms
• Analysts also compute the Internal Rate of Return (IRR) of proposed
investments
• IRR is a discounted measure of project worth
• Selection criterion: accept a project with IRR greater than the average cost
of capital in the country
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14. 4. A full example: ‘Enhancing the Resilience of Agro-
ecological Systems’ Project in Malawi (1/3)
• Goal: enhance the provision of ecosystem services to improve food and
nutrition security of rural communities in targeted catchment areas.
– Funds activities aimed at improving the productivity and resilience of
agricultural systems of vulnerable rural poor
CBA is based on Household (HH) Models simulating the adoption of:
– conventional farming under the WoP scenario (BAU)
– improved agriculture practices and catchment management under the
WP one
– The analysis focuses on the catchment areas related to irrigated fields
benefiting a population of 16,600 HHs
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15. 4. An example: ‘Enhancing the Resilience of Agro-
ecological Systems’ Project in Malawi (2/3)
• Costs: estimated on the basis of planned Project activities
• Economic benefits: increased net incomes of the HHs involved in Project
activities (yields increase & labour use reduction)
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16. 4. An example: ‘Enhancing the Resilience of Agro-
ecological Systems’ Project in Malawi (3/3)
• IRR = 27.5% (> 25% = cost of capital in Malawi); NPV = USD 7 million (20-year)
• Also generate environmental benefits (carbon sequestration) @ price = 3 $/ton,
with a consequent increase in the IRR (33%) and NPV (9 million)
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17. Useful material for further reading (1/1)
• Boardman A., Greenberg D., Vining A., Weimer D. 2014. Cost-Benefit
Analysis. 4th
Edition. The Pearson Series in Economics.
• Gittinger J.P. 1995. Economic Analysis of Agricultural Projects. 2nd
edition. The Johns Hopkins University Press, Baltimore and London
• Zerbe R.O., Dively D.D. 1994. Benefit-Cost Analysis in Theory and
Practice. Harper Collins College Publishers.
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18. Thank you!