In fact, while some manufacturing jobs have been lost due to foreign competition, many more have been lost simply because of slow growth in demand for manufactured goods.
The people behind these businesses endlessly adjust what and how they produce in response to extraordinary (often local) competition and fluctuations in demand.
面对激烈的（通常是本地企业的）竞争以及需求变化， 这些企业背后的人不停地调整该如何生产、怎样生产。
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Even when demand is booming, competition to meet it can be brutal.