The most parsimonious evolutionary hypothesis is that holometabolans originated from hemimetabolan ancestors. Occam's razor also suggests that this is the 'more parsimonious hypothesis'. Opponents have argued that psychological egoism is not more parsimonious than other theories. Recursive partitioning has been used to identify more parsimonious criteria. An ancestral taxon generating two or more descendants requires a longer, less parsimonious tree. Samuelson's "Foundations" demonstrates that economic analysis benefits from the parsimonious and fruitful language of mathematics. Still, one might argue that loss aversion is more parsimonious than loss attention. The generator comprehension is more parsimonious. Observers thought them parsimonious, and their lifestyle simple, even boring. These families of basis functions offer a more parsimonious fit for many types of data.