Van Praag, B. M., &Van der Sar, N. L. (1988). Household cost functions and equivalence scales. Journal of human Resources, 193-210.

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Van Praag, B. M., &Van der Sar, N. L. (1988). Household cost functions and equivalence scales. Journal of human Resources, 193-210.

  DOI: 10.2307/145775