美国国内资本增加，使劳动力的边际产量和边际产量价值增加，引起劳动力需求曲线右移，所以工人工资上涨，工人就业数量增加。
The increase in capital increases the marginal product of labor and the value of marginal product of labor for any given quantity of labor.
移民增加导致劳动力供应增加，引起工资降低。因为和土地和资本结合的劳动力数量增加，使资本和土地的边际产量增加，土地和资本的租金也将增加。
With more labor working with capital and land, the marginal product of capital and land is higher, so rents earned by owners of land and capital would increase.
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