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Suppose you are Li Hua, and there is a garden in your home. Some flowers and vegetables are planted in the garden.

cannot

impossible

According to the law of diminishing marginal income, when a variable factor of production is put into several fixed factors of production, the total output will increase first, and so will marginal product. But at a certain point, marginal product will start to decrease, and eventually even negative value will appear, thus reducing the total output. So when a friend doubles his helper, his output will not double.