The correct answer is $\boxed{\frac{Y}{K}}$.
The capital-elasticity of output is a measure of how much output changes in response to a change in capital. It is calculated by taking the percentage change in output and dividing it by the percentage change in capital.
In mathematical terms, the capital-elasticity of output is given by:
$$\epsilon_k = \frac{\frac{\Delta Y}{Y}}{\frac{\Delta K}{K}}$$
where $\Delta$ denotes a change in a variable.
If the capital-elasticity of output is greater than 1, then output increases by more than the percentage increase in capital. This means that capital is a relatively important input in the production process.
If the capital-elasticity of output is less than 1, then output increases by less than the percentage increase in capital. This means that capital is a relatively unimportant input in the production process.
If the capital-elasticity of output is equal to 1, then output increases by the same percentage as capital. This means that capital is a neutral input in the production process.
The capital-elasticity of output is an
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