小李逛商场时看中了一条标价499元的裙子，觉得有点贵，就没买。标价499元体现了货币的( )职能。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31895' and id < 2549823 and id<>'2549823' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31895' and id > 2549823 and id<>'2549823' order by id asc limit 5