In this article, Professor Dintenfass reexamines entrepreneurial efficiency in the interwar British coal industry. Using previously neglected company documents, he shows that cost-reducing and price-enhancing innovations in coal extraction, organizational practice, and marketing were not widely diffused, though neither geology, finance, nor industrial relations inhibited their adoption. He concludes that mismanagement was an important cause of the British coal industry's misfortunes in the 1920s and 1930s, but that the coalowners' failure to employ the new techniques cannot be attributed to the structure of the industry or to the survival of outmoded forms of business organization.

In this study of a neglected topic, Dr. Channon examines the attempts of British railway leaders to regulate competition among routes. Drawing illustrative material from the management of Anglo-Scottish traffic and making comparisons with the American railroad industry, Dr. Channon concludes that pooling agreements did not provide the long-term stability and savings that railway managers sought. Changes in traffic patterns led to dissatisfaction with pool allocations, and competitive pressures from outside, as well as legal and political uncertainties, undermined cconfidence in the pools. In contrast to the United States, where railroads were able to turn to consolidation after pooling had failed, in Britain this strategy was not a politically viable option.

The flattening of yield curves at long-term maturities is proven to be approximately proportional to the reciprocal of the time to maturity under general conditions. This is a consequence of the persistence of earlier forward rates in the averaging process, which produces yields from forward rates. This relationship suggests the use of a “reciprocal maturity yield curve,” which significantly facilitates the interpretation of the behavior of long-term yields by linearizing them for display over a shorter interval. This is illustrated using a yield curve for U.S. Treasury bills.

A procedure is developed for the valuation of options when there are two underlying state variables. The approach involves an extension of the lattice binomial approach developed by Cox, Ross, and Rubinstein to value options on a single asset. Details are given on how the jump probabilities and jump amplitudes may be obtained when there are two state variables. This procedure can be used to price any contingent claim whose payoff is a piece-wise linear function of two underlying state variables, provided these two variables have a bivariate lognormal distribution. The accuracy of the method is illustrated by valuing options on the maximum and minimum of two assets and comparing the results for cases in which an exact solution has been obtained for European options. One advantage of the lattice approach is that it handles the early exercise feature of American options. In addition, it should be possible to use this approach to value a number of financial instruments that have been created in recent years.

This study is an ex post performance test comparing the accuracy of an American model to a European model for valuing listed options. Specifically, the Geske and Johnson American put valuation model is compared with the Black and Scholes European put model. On average, both models undervalue, relative to market prices, put options. However, the Geske and Johnson model values are significantly closer to market prices than are the Black and Scholes values.

Dissatisfaction occasionally has been expressed with traditional measures of duration for immunization on conceptual grounds. However, more elegant duration measures have not been found to be superior to the traditional ones in empirical tests of immunization efficacy. Under the assumption that the term structure of continuously compounded interest rates can be expressed as a polynomial, Chambers and Carleton (1981) demonstrate that the finite and noninstantaneous return of a default-free bond can be expressed as a vector product of a duration vector and a shift vector. This study derives immunization strategies from the model and tests them. The results of the portfolio tests indicate that the traditional duration approach of Macaulay provides enhanced immunization relative to maturity approaches or naive approaches. However, the duration vector approach produces further improvements.