The growing demand pulls up profit, which, in turn, induces firms to invest in new capacity. But most of the profits of the growing competitors are an illusion because they are plowed back into new plant and equipment as the business grows. If high profits on these investments can be earned after growth slows, then all is well. But in a commodity industry, as soon as the growth in demand slows down, the profits vanish for firms without competitive advantages. Like some sort of economic black hole, the growing commodity industry absorbs more cash from the ordinary competitor than it ever
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