商品的边际替代率递减规律决定了无差异曲线（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31436' and id < 2520110 and id<>'2520110' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31436' and id > 2520110 and id<>'2520110' order by id asc limit 5