解释经济周期成因的创新理论的核心是（ ）。[2009年5月三级真题]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25261' and id < 2138457 and id<>'2138457' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25261' and id > 2138457 and id<>'2138457' order by id asc limit 5