One sure way you can tell how quickly a new idea -- for example, the idea of "privatization" -- 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 editors, who are vitally concerned with this question. The method described above for determining how quickly a new idea is taking hold relies on which one of the following assumptions? ['Dictionary editors have exact numerical criteria for telling when a word has passed into common usage.', 'For a new idea to take hold, dictionary editors have to include the relevant word or words in their dictionaries.', 'As a word passes into common usage, its meaning does not undergo any severe distortions in the process.', 'Words denoting new ideas tend to be used before the ideas denoted are understood.']