| Table 9: Marginal Benefits (MB) of Highway Capital Mean Values 1950 - 1991 |
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| Code | Industry | MB |
| 1 | Agriculture, Forestry and Fisheries | 0.01378 |
| 2 | Metal Mining | -0.00027 |
| 3 | Coal Mining | -0.00030 |
| 4 | Crude Petroleum and Natural Gas | 0.00241 |
| 5 | Nonmetallic Mineral Mining | -0.00024 |
| 6 | Construction | 0.03198 |
| 7 | Food and Kindred Products | 0.01853 |
| 8 | Tobacco Manufactures | 0.00006 |
| 9 | Textile Mill products | 0.00188 |
| 10 | Apparel and Other Textile Products | 0.00160 |
| 11 | Lumber and Wood Products | 0.00166 |
| 12 | Furniture and Fixtures | 0.000006 |
| 13 | Paper and Allied Products | 0.00219 |
| 14 | Printing and Publishing | 0.00282 |
| 15 | Chemicals and Allied Products | 0.00559 |
| 16 | Petroleum Refining | 0.00319 |
| 17 | Rubber and Plastic Products | 0.00189 |
| 18 | Leather and Leather Products | 0.000005 |
| 19 | Stone, Clay and Glass Products | 0.00088 |
| 20 | Primary Metals | 0.00756 |
| 21 | Fabricated Metal Products | 0.00330 |
| 22 | Machinery, Except Electrical | 0.00583 |
| 23 | Electrical Machinery | 0.00372 |
| 24 | Motor Vehicles | 0.00741 |
| 25 | Other Transportation Equipment | 0.00408 |
| 26 | Instruments | 0.00006 |
| 27 | Miscellaneous Manufacturing | 0.00005 |
| 28 | Transportation and Warehousing | 0.01219 |
| 29 | Communication | 0.00288 |
| 30 | Electric Utilities | 0.00321 |
| 31 | Gas Utilities | 0.00122 |
| 32 | Trade | 0.05983 |
| 33 | Finance, Insurance, and Real Estate | 0.03638 |
| 34 | Other Services | 0.05817 |
| 35 | Government Enterprises | 0.00123 |
| Total | 0.294 | |