We have carried out a radiostereometric study of 50 patients (54 knees) with osteoarthritis of the knee who were randomly allocated to receive a cemented or a hydroxyapatite-coated femoral component for total knee replacement. The patients were also stratified to receive one of three types of articulating surface (standard, rotating platform, Freeman-Samuelson (FS)1000) all based on the Freeman...

In the paper we introduce technological comparative advantage and transaction costs into the Heckscher-Olin (HO) model and refine the HO theorem, the Stolper-Samuelson theorem, the Rybczynski theorem, and factor equalization theorem. The refined core theorems can be used to accommodate recent empirical evidence that is at odds with the core theorems.

This paper focuses on productivity growth differentials between manufacturing and services, deindustrialization, and changes in the real exchange rate. Using a Ricardian trade model with a continuum of goods that introduces nontraded services, the paper investigates these interrelationships. The main results are as follows: (i) if deindustrialization proceeds in both home and foreign countries,...

P aul Samuelson (1969) was once asked by a physicist for a law in economics that was both nontrivial and true. This is a difficult challenge, as many (roughly) true results are in the end rather trivial (for example, demand curves slope down), while many nontrivial results in economics in fact require too much sophistication and rationality on the part of the agents to actually hold true in pra...

Aggregation without the Aggravation? Nonparametric Analysis of the Representative Consumer In the tradition of Afriat (1967), Diewert (1973) and Varian (1982), we provide a revealed preference characterisation of the representative consumer. Our results are simple and complement those of Gorman (1953, 1961), Samuelson (1956) and others. They can also be applied to data very readily and without ...

It is quite common to associate the equilibrium rate of interest with the marginal product of capital. However, not all economists have endorsed this practice, and indeed many have challenged the explanation of interest according to marginal principles. In this paper I offer a resolution to this dispute by first agreeing with the critics of mainstream models, but then demonstrating that the "ju...

Paul Samuelson’s (1958) overlapping generations model has turned 50. Seldom has so simple a model been so influential. Its “wow” factor, and the feeling of surprise at its originality and coolness have not paled with the years. The paper, in spite of its ripe age, still elicits wonder. Starting from the uncontroversial observation that “we live in a world where new generations are always coming...

This paper studies competitive equilibrium over time of a one good model in which the agents are members of a population which grows at a constant rate. Each agent lives for n periods and in the i-th period of his life receives an endowment of ei units of goods. Goods can neither be produced nor stored. The model is thus the n-period generalization of the twoand three-period models studied by S...

This paper explores the effect of income inequality on the real exchange rate, through two general equilibrium channels: (i) the aggregation of individual demands derived from non-homothetic preferences; (ii) the workings of Samuelson-Balassa through the effect of inequality on the aggregation of human capital. A variety of effects are possible depending on the sectoral expenditure elasticities...

a r t i c l e i n f o This paper examines the effects of conversion of one type of physical trade restrictions into another on the intra-country wage inequality in a standard 2 × 2 × 2 Heckscher–Ohlin–Samuelson model. It shows that a conversion of an import-quota into an equivalent voluntary export restraint raises wage-inequality in the country importing the unskilled-labor intensive good and ...