Thus our use of the same equivalence scale for both cash and in-kind expenditures is a reasonable middle-of-the-road solution”. Applying the standard OECD equivalence scale, which is the square root of household size, this is converted to USD 20 000 of equivalent income attached to each individual (column 1). The child of 8 years is enrolled in primary school (value estimated as USD 3 000), whereas the 13-year-old is in lower secondary education (value USD 5 000).