Example sentences of "[verb] have been a [adj] factor " in BNC.

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1 Many are extremely tense , not only since the infarct , but have been for many years , and it is possible that the inward tension that they suffer has been a contributory factor to their disease .
2 It is somewhat paradoxical that structural shift does not appear to have been a major factor in productivity growth after the war , because it is well known that structural imbalances contributed substantially to unemployment between the wars .
3 In explaining the shape of the bargaining structure in Japan , as with the industry-wide structures in Europe and the decentralised arrangements in the United States , the wishes and expressed policies of the bargaining parties themselves would appear to have been a predominant factor .
4 The increasing processing and chemicalization of our food and drink appears to have been a major factor in the rise of chronic disease in this country in the past three to four decades by causing much chemical stress on the body and its inner metabolic balances .
5 In archaeological literature , goods imported in small quantities have often been studied under the general term of ‘ prestige goods ’ , and , as such , control over these resources appears to have been a major factor in the rise and fall of early social hierarchies ( Friedman and Rowlands 1977 ) .
6 For all these reasons multi-employer bargaining came to predominate in non-manufacturing industries and , more exceptionally , elsewhere in the concentrated industries of basic steel and the railways where government intervention seems to have been a decisive factor in shaping the bargaining process ( Livernash , 1963 ) .
7 Individual union policy seems to have been a major factor behind signing technology agreements , most of which derive from four white collar unions : APEX ( general clerical union ) , ASTMS ( general technical and supervisory union ) , NALGO ( local government staff ) and TASS ( technical staff in engineering ) .
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