c. Suppose that capital input (the number of buses) is decreased by 3 percent next year (which, certain older buses are taken out of service). Assuming that the other inputs are held constant, determine the approximate percentage change in output.
d. What type of returns to scale appears to characterise the transportation system (ignore the issue of statistical significance)?
e. Discuss some of the methodological and measurement problems one might encounter in using time-series data to estimate the parameters of this model.
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