The isoquant gets flatter as we move down and to the right because the rate of substitution changes as factor proportions change. If there are already a lot of workers sharing a small amount of equipment, additional workers won't add much to output. If the firm wishes to use more workers and less equipment beyone point C it will need to hire more and more workers to substitute for each unit of capital given up. This is sometimes called a diminishing rate of technical substitution.
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