  Recently a measure for Economic Complexity named ECI+ has been proposed by
Albeaik et al. We like the ECI+ algorithm because it is mathematically
identical to the Fitness algorithm, the measure for Economic Complexity we
introduced in 2012. We demonstrate that the mathematical structure of ECI+ is
strictly equivalent to that of Fitness (up to normalization and rescaling). We
then show how the claims of Albeaik et al. about the ability of Fitness to
describe the Economic Complexity of a country are incorrect. Finally, we
hypothesize how the wrong results reported by these authors could have been
obtained by not iterating the algorithm.
