These help firms keep much closer track of orders, inventories and the like, and so help them to determine faster and more accurately when extra staff are needed.

同时，他认为这种改变部分得益于电脑系统的极大改善，使得各公司能够更好的对订单库存之类的信息进行跟踪，在需要增加人手的时候也能更迅速更准确的进行决策。

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These help firms keep much closer track of orders, inventories and the like, and so help them to determine faster and more accurately when extra staff are needed.

ECONOMIST: The outlook for jobs in America