For some products, markets have historically shown very little turbulence and are unlikely to alter dramatically in the future. The market for undertakers' services will probably remain stable and simple demand forecasting techniques may be appropriate. However, many industries involving high technology are extremely turbulent, with changes in technology occurring, sometimes overshadowing existing products. As an example, typesetting an telex bureau saw steady growth during the 1980s but then saw a rapid contraction following the widespread
Advance of low-cost personal computers. Historical trends could not upon to predict
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