商品的价格时而高于其价值，时而低于其价值，表明（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31901' and id < 2550443 and id<>'2550443' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31901' and id > 2550443 and id<>'2550443' order by id asc limit 5