One sure way you can tell how quickly a new idea -- for example, "globalization" -- is taking hold among the population is to monitor how fast the word or words expressing that particular idea are passing into common usage. Professional opinions of whether or not words can indeed be said to have passed into common usage are available from dictionary authors, who are acutely aware of these changes. The method described above for determining how quickly a new idea is taking hold relies on which one of the following assumptions? ['Dictionary authors are not professionally interested in words that are only rarely used.', 'Dictionary authors have an exact numerical calculation for deciding when a word has passed into common usage.', 'For a new idea to take hold, dictionary authors have to include the relevant word or word in their dictionaries.', "The word's meaning does not undergo any severe distortions in the process of passing into common usage."]