PLEASE HELP! THIS IS INDEED TIMED Despite the vast semiarid expanse east of the Cascades, more than of the state's area is forested, and the lumber and wood-products industry, so important in the early development of the state, remains one of its largest.

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One drawback of voluntary trade is that it a. requires two groups to use a common language b. can make one group dependent upon another for necessary goods c. doesn't occur unless there is a shortage of goods for at least one group d. forces groups to rely on themselves to produce all the goods they need