A variety of explanations have been offered for the observed cross-linguistic preponderance of suffixes over prefixes. Many are couched in terms of synchronic advantages, such as the cognitive simplicity of cross-category harmony between syntax and morphology, and preferences for processing the lexical meaning in stems before the grammatical material in affixes. But hypotheses about functional advantages cannot constitute explanations in themselves without accounts of the mechanisms by which the advantages are translated into grammatical structure. Here it is shown that the numerous exceptions to such hypotheses can be explained when the individual histories of the affixes are considered, including both their sources and the steps by which they develop.It has long been recognized that suffixes outnumber prefixes cross-linguistically. As early as 1921 Edward Sapir remarked, "Of the three types of affixing-the use of prefixes, suffixes, and infixes-suffixing is much the commonest. Indeed, it is a fair guess that suffixes do more of the formative work of language than all other methods combined." (1921, 67) Several kinds of explanations have been offered for the suffixing preference. Some have focused on cross-category harmony, proposing that speakers prefer consistent ordering of heads and dependents across syntax and morphology. Since more languages show head-final syntactic structure (OV), it is natural that they should also show head-final morphological structure (Stem-suffix). Other explanations have focused on processing, proposing that hearers prefer to process stems before affixes, since they contain richer information. Still other explanations have focused on production, proposing that since speakers tend to elide the ends of words, morphemes occurring later in words are more likely to erode into affixes than those occurring earlier.But these proposals, even in combination, do not account fully for the morpheme orders we find. There are numerous examples of prefixes in languages with robust, head-final (OV) syntactic order. The identification of speaker preferences is a reasonable first step toward possible explanation, but we cannot claim to explain particular structures if we have not identified the actual mechanisms by which such preferences might shape grammar. As noted by Greenberg (1957), mechanisms might be identified in two areas: (i) origin, that is, circumstances that could lead to the development of certain structures, and (ii) survival, that is, circumstances that could contribute to their stability.Here we shall examine some situations in which explanations based on cross-category harmony, processing, and production fail to account for morphological structure. These involve prefixes in languages with clear, headfinal (OV) syntactic structure. It will be shown that a key to explaining such structures lies first in distinguishing the kinds of affixes involved and then uncovering the different paths by which they develop.
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