Table I. Annual Depreciation Rates by Categories4
Categories |
Equipment |
Structures |
Depreciation |
Road |
— |
0.0202 |
0.0202 |
Railways |
0.0589 |
0.0275 |
0.0328 |
Electricity |
0.050 |
0.0211 |
0.0260 |
Gas |
— |
0.0237 |
0.0237 |
Water |
— |
0.0152 |
0.0152 |
Telecoms |
0.1375 |
0.0237 |
0.0429 |
Note: For each asset, the depreciation rate is defined
as a weighted average of the corresponding rates used for
equipments and structures. The depreciation rates for
equipment and structures are taken from Bureau of Eco-
nomic Analysis (2003), table C, page M-31.
Figure 1 Non-Parametric Estimated Efficiency Function of Public Investments
in Streets and Highways. United States, 1951-1992 (US$ million, Historical Cost)

Notes: For each estimated point, the corresponding 95% confidence limits are represented by a sign ” + ”
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