右图是某种商品的价格波动图。B点比A点价格低的根本原因是（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27028' and id < 2241422 and id<>'2241422' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27028' and id > 2241422 and id<>'2241422' order by id asc limit 5