validation for food expenditure
Arguments
- detail
if FALSE, only major food commoditiy groups are shown.
- datasource
Datasource for demand (FAO, FAOpre2010, FAOpost2010)
- expenditureType
Either "agPrimary" for agricultural primary products (demand * prices), or "food" for total food expenditure including value-added marketing margins based on Chen et al. 2025 regression coefficients