It is useful to be able to predict the extent to which a price change will affect supplyand demand.

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It is useful to be able to predict the extent to which a price change will affect supplyand demand.
It is useful to be able to predict the extent to which a price change will affect supply
and demand.

It is useful to be able to predict the extent to which a price change will affect supplyand demand.
it:形式主语;
is系动词,作谓语的一部分;
useful表语,作谓语的一部分;
to be able to predict the extent to which a price change will affect supply:真正的主语.
真正的主语是一个不定式短语,其中the extent to which a price change will affect suppl是predict的宾语,这个宾以extent为中心词,to which a price change will affect supply是定语从句,修饰extent.
在这个定语从句中,a price change是主语,will affect是谓语;supply是宾语.

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