Given the volatile nature of demand in many industries, an assumption of stability is suspect, meaning that forecasts based on historical sales data may be less accurate than the historical data suggest.
( ( Given ( ( the ( volatile nature ) ) ( of ( demand ( in ( many industries ) ) ) ) ) ) ( , ( ( ( an assumption ) ( of stability ) ) ( ( ( ( is suspect ) , ) ( meaning ( that ( ( forecasts ( based ( on ( historical ( sales data ) ) ) ) ) ( may ( be ( ( less accurate ) ( than ( ( the ( historical data ) ) suggest ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBN Given) (NP (NP (DT the) (JJ volatile) (NN nature)) (PP (IN of) (NP (NP (NN demand)) (PP (IN in) (NP (JJ many) (NNS industries))))))) (, ,) (NP (NP (DT an) (NN assumption)) (PP (IN of) (NP (NN stability)))) (VP (VBZ is) (ADJP (JJ suspect))) (, ,) (VP (VBG meaning) (SBAR (IN that) (S (NP (NP (NNS forecasts)) (PP (VBN based) (PP (IN on) (NP (JJ historical) (NNS sales) (NNS data))))) (VP (MD may) (VP (VB be) (ADJP (ADJP (RBR less) (JJ accurate)) (SBAR (IN than) (S (NP (DT the) (JJ historical) (NNS data)) (VP (VBP suggest)))))))))) (. .)))
Demand is unpredictable by nature, and assumptions shouldn't be made of stability.
( ( ( ( ( Demand ( is ( unpredictable ( by nature ) ) ) ) , ) and ) ( assumptions ( ( should n't ) ( be ( made ( of stability ) ) ) ) ) ) . )
(ROOT (S (S (NP (NN Demand)) (VP (VBZ is) (ADJP (JJ unpredictable) (PP (IN by) (NP (NN nature)))))) (, ,) (CC and) (S (NP (NNS assumptions)) (VP (MD should) (RB n't) (VP (VB be) (VP (VBN made) (PP (IN of) (NP (NN stability))))))) (. .)))