Final answer:
Technological advances and changing customer tastes/lifestyles can cause market decline, but powerful competitors do not contribute to market decline.
Explanation:
Technological advances can be a driving factor in market decline as they lead to obsolescence of existing products, impacting demand. Changing customer tastes or lifestyles can also cause market decline as preferences shift away from current offerings. However, powerful competitors are not a potential cause of market decline; in fact, strong competition may lead to innovation and market growth.
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