what are the elements and characteristics of trends?
['Trend. ... ', 'Duration of time, Acceptability, Cultural Basis, Transitory increase or decrease. ... ', 'Duration of time. ... ', 'Acceptability. ... ', 'Cultural Basis. ... ', 'Transitory Increase or decrease. ... ', 'Driver, Enabler, Blocker. ... ', 'Microtrend, Macrotrend, Megatrend, Gigatrend, Nanotrend.']