AN ECONOMETRIC ANALYSIS OF DIFFERENCES BETWEEN MOTOR CARRIERS: IMPLICATIONS FOR MARKET STRUCTURE.

Β. Starr McMullen · Hiroshi Tanaka

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Abstract

Despite repeated findings of constant returns to scale in trucking, there have been increases in motor carrier industry concentration following the Motor Carrier Act of 1980. This study uses a translog cost function to examine differences between large (Instruction 27) and small (Instruction 28A) motor carriers. Results show significant structural differences between large and small carriers, supporting the hypothesis that larger firms offer a different, possibly higher quality, service by using an extensive network system. Significant economies associated with increasing average load, average length of haul, and average shipment size are found for large firms. Smaller firms appear already to have taken advantage of these economies and therefore have no incentive to grow in size. These findings suggest that increases in industry concentration will continue as large firms try to take advantage of unexploited, networkrelated economies.

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References

1969Maximum likelihood estimation of a complete system of demand equations 1991The Economic Effects of Surface Freight Deregulation 1989Deregulation and Scale Economies in the U. S. Trucking Industry: An Econometric Extension of the Survivor Principle 1988THE IMPACT OF DEREGULATION ON THE PRODUCTION STRUCTURE OF THE MOTOR CARRIER INDUSTRY 1988MARKETING ECONOMIES AND THE RESULTS OF TRUCKING DEREGULATION IN THE LESS-THAN-TRUCKLOAD SECTOR 1985The Role of Imports from the Newly-industrializing Countries in U.S. Production 1989U.S. MOTOR CARRIER COST STRUCTURE UNDER DEREGULATION 1990Regulatory Reform and Technical Change: New Evidence of Scale Economies in Trucking

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