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Think about it this way : In 2015 the labor force in the United States contained over 158.6 million workers , according to the U.S. Bureau of Labor Statistics . Similarly , the total area of the United States is 3,794,101 square miles . These are large numbers for such crucial resources , however , they are limited . Because these resources are limited , so are the numbers of goods and services we produce with them . Combine this with the fact that human wants seem to be virtually infinite , and you can see why scarcity is a problem .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.