Brazil (2009), Chile (2009), Costa Rica (2009), Guatemala (2006) and Nicaragua (2005). The differences in the characteristics of the surveys used to measure household income and the criteria used by the countries to deal with outlying values and correct for non-response to questions about income may substantially affect measurements of inequality (see box 1.4). Again, conditions of strict “dominance” commonly do not obtain between different countries’ income distributions, in other words, one distribution may be more equitable than another for one subset of the population and more inequitable for another, yielding different countiy rankings depending on the indicator used (see box 1.5). Taking these caveats into account, a regional overview of inequality ranks the Bolivarian Republic of Venezuela and Uruguay as the countries with the least concentrated income, while the Plurinational State of Bolivia, Colombia and Guatemala are at the other extreme (see figure 1.9).