An Economic Assessment of Banana Genetic Improvement and ...

CONCEPTUAL FRAMEWORK AND SAMPLE SURVEY DESIGN 21
these analyses is the theoretical model of
the household farm, which is particularly
suitable for investigating farmer decisionmaking
in situations where the costs of
transacting in markets can be high. The
economic surplus approach is applied at
the industry level, and is aimed at providing
key information to support policy decisions
concerning investment priorities. The
corresponding analyses and more details
regarding each model are presented in
separate chapters of Part III.
The sample design represents an effort
to address the challenge of defining the
“counterfactual.” The research team developed
a sampling frame that controls for
previous exposure to new banana cultivars
and practices. The sample of villages and
households is also stratified by elevation, a
parameter that is highly correlated with
pests and disease pressures, as well as soil
fertility, which are major constraints to banana
productivity and the focus of banana
improvement efforts.
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