Alain Alcouffe wrote: > Well, Mason's message surprised me : > First, was obsolescence a very popular term among economists around > 1900? It does not appear in Marshall's Principles index. > Second, obsolescence is only a small part of what Schumpeter intended to > describe with "creative destruction" as far as I understand it (an > explosive, exponential and cumulative process with far fetched effects > ignated by some initially localized innovation). The expression was moral depreciation. Michael Perelman