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Issues and Methods in Livelihoods Analysis. Gerald Shively Purdue University shivelyg@purdue.edu Prepared for the CIFOR/PEN Annual Meeting, January 11, 2008, Barcelona. Objectives Resources Labor Land Capital Technologies Constraints Tenure Credit. Livelihoods Concepts.

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issues and methods in livelihoods analysis

Issues and Methods in Livelihoods Analysis

Gerald ShivelyPurdue University

shivelyg@purdue.edu

Prepared for the CIFOR/PEN Annual Meeting, January 11, 2008, Barcelona

livelihoods concepts

Objectives

  • Resources
    • Labor
    • Land
    • Capital
  • Technologies
  • Constraints
    • Tenure
    • Credit
Livelihoods Concepts
primary research concern

Describing behavior is good

Explaining behavior is better

Understanding why behaviors differ across households is best

We want to understand not only WHAT…

but WHY

Primary research concern
objectives

What does the household desire?

    • Profit maximization
    • Food security
    • Risk avoidance
    • Wealth accumulation
    • Food sales
    • Food purchases

The answer has implications for models, prescriptions and predictions

Objectives
what can households allocate

Land

  • Labor
  • Working capital

Why focus on allocation?

This is a zero-sum prospect:

allocating a resource to one activity precludes allocating it to another

Most economic activities have substitutes

What can households allocate?
households also choose technologies

Traditional vs. modern

  • Embedded vs. disembodied
  • Does it work?
  • How well does it work?
  • Is it available?
  • Is it adaptable?
  • Is it divisible?
  • Is it biased?
  • Technical vs. economic considerations
Households also choose technologies
heterogeneity is your friend

Differences are good

Variance in the data is good

This variance is what allows one to understand why different situations, motivations, and constraints lead to different outcomes.

Heterogeneity is your friend
diagnostic heuristic approach ashley 2000 raintree nafri 2005

Good place to begin

Identify “Basic Needs” vs. “Supply Systems”

  • Direct linkages crops + livestock + cash  food
  • Indirect linkages crops + forests + labor  cash

Analytical focus:

objectives; means; performance; problems; solutions

Diagnostic/Heuristic Approach(Ashley 2000; Raintree/NAFRI 2005)
asset vulnerability approach castro 2002 difd 1999

More formal approach

Identify inputs, processes, and outcomes

Capital and assets

Transforming structures and processes(including policies and institutions)

Asset/Vulnerability Approach(Castro 2002; DIFD 1999)

Outcomes

econometric approach

Typically has a guiding structure, but often specified as a reduced form: y=f(x)

  • Dependent (lhs) variables
    • outcomes (income, expenditures)
    • choices (labor allocation, land use, technology)
  • Independent (rhs) variables
    • exogenous variables
    • resources, parameters, constraints
Econometric approach
example agricultural yield

Lets assume that yield depends on labor input and technology

Yield (kg/ha) = b0

+ b1*labor input (days/ha)

+ b2*technology indicator

Let indicator for the new technology be 0/1

In the regression b2 will measure the avg. impact of the new technology on yield.

Example: Agricultural Yield
some difficulties

Does b2 really measure the impact of the new technology on agricultural yield?

Where does labor come from? Do some uses of labor displace other uses (e.g. competition between off-farm & forest)?

  • Correlation vs. causation
  • Omitted variables
  • Hidden causes
  • Endogenous regressors
Some difficulties
potential solutions

Instrumental variable techniques

    • 2 stages, 2nd relies on results from 1st
  • Seemingly Unrelated Regressions (SUR)
  • Structural systems of equations
    • use obvious constraints to shape regressions
  • Natural experiments
Potential solutions
examples

2SLS

    • 1st stage: technology choice depends on ???
    • 2nd stage: yield depends on technology choice
  • Seemingly Unrelated Regressions (SUR)
    • Technology choice and labor allocation in parallel regressions
  • Structural systems of equations
    • Labor shares, each with it’s own regression
  • Natural experiment
    • Exogenous random assignment of new technology
Examples
measurement of variables and choice of technique

-∞ ≤ y ≤ +∞ linear regression

0≤ y ≤ +∞ OLS or 1-tail Tobit

0≤ y ≤ 1 2-tail Tobit

0 or 1 Probit or logit

Measurement of variables and choice of technique
references

Ashley, Caroline (2000) Applying Livelihood Strategy Approaches to Natural Resources Management Initiatives: Experiences in Namibia and Kenya. Working Paper 134. London: Overseas Development Institute.

Castro, A. Peter (2002) Sustainable Livelihoods Analysis: An Introduction. Paper presented at conference “Public Goods and Public Bads in Nature: From Landscapes to Genomes in South Asia.” Syracuse and Cornell Universities, February 23, 2002.

DIFD (1999) Sustainable Livelihoods Guidance Sheets. London: Department for International Development.

Raintree, John (2005) Livelihoods Analysis: A Checklist. In Improving Livelihoods in the Uplands of the Lao PDR. NAFRI, NAFES, NUOL.

References