Portfolio Performance Gauging in Discrete Time Using a Luenberger Productivity Indicator

This paper proposes a pragmatic, discrete time indicator to gauge the performance of portfolios over time. Integrating the shortage function (Luenberger, 1995) into a Luenberger portfolio productivity indicator (Chambers, 2002), this study estimates the changes in the relative positions of portfolios with respect to the traditional Markowitz mean-variance efficient frontier, as well as the eventual shifts of this frontier over time. Based on the analysis of local changes relative to these mean-variance and higher moment (in casu, mean-variance-skewness) frontiers, this methodology allows to neatly separate between on the one hand performance changes due to portfolio strategies and on the other hand performance changes due to the market evolution. This methodology is empirically illustrated using a mimicking portfolio approach (Fama and French 1996; 1997) using US monthly data from January 1931 to August 2007.shortage function, mean-variance, mean-variance-skewness, efficient portfolios, Luenberger portfolio productivity indicator

The Geography of Retail Inventory

How different are retailers' inventory levels around the world? Specifically, are retailers' inventories constant across countries, converging, or at least co-integrating? These might be viewed as various forms of global determinism. To see which of these forms hold, I use a novel dataset integrated from Dow Jones, Edgar, Bureau van Dijk (Europe), World'Vest Base, Multex, KIS (Korea Information Service), Teikoku of Japan, Huaxia of China, and COMPUSTAT. The dataset consists of 27,000 firm-year observations for 4,100 retailers in 23 countries, for the period 1983 through 2004. I find evidence to reject all the three forms of global determinism. Instead, I report evidence consistent with an alternative hypothesis - local contingency - in which country effects can explain inventory differences around the world. I also show that this conclusion is robust in numerous ways.Inventory; retailing; international comparison; global determinism; local contingency

Tariff index theory

For a single tariff, the height of the tariff is an unambiguous measure of the policy's restrictiveness. With more than one tariff, theory has not provided an extension that captures the idea of the tariff's height, so analysts have used index numbers such as the mean and the coefficient of variation (standard deviation divided by the mean) of tariffs. By contrast, the theoretical literature on the piecemeal reform of tariffs shows that efficiency gains from tariff reform depend on complex conditions that have little relation to the mean or variance of tariffs. But in the absence of a connection between theory and empirical measures, it is difficult to know whether to discard the measures. Moreover, the piecemeal reform question of measuring the welfare gain from a tariff is not directly related to the problem of evaluating the height of restrictiveness. The problem of finding a single number analogous to the height of tariffs is the tariff index number problem. The authors have developed a solution: the Trade Restrictiveness Index, which they define as the uniform tariff factor that is equivalent in trade restrictiveness (equivalent in the balance of trade) to the actual differentiated tariff structure. Here, the author develops the Trade Restrictiveness Index in terms of mean and variance-covariance indexes of the tariff schedule. There are two payoffs. First, the Trade Restrictiveness Index can be decomposed into expressions that rescue the commonsense idea that lower mean and lower variance of tariffs are both efficient. Second, a special case is offered in which the proper weights in the mean and variance of tariffs are the observed trade weights. Thus, the Trade Restrictiveness Index is superior to traditional summary measures such as the average tariff rate and the coefficient variation for the tariff schedule. It requires only limited additional information on the structure of the economy to yield a measure that is preferable on both theoretical and practical grounds.Environmental Economics&Policies,Export Competitiveness,Trade Policy,TF054105-DONOR FUNDED OPERATION ADMINISTRATION FEE INCOME AND EXPENSE ACCOUNT,Economic Theory&Research

Auction algorithms for generalized nonlinear network flow problems

Thesis (Ph.D.)--Boston UniversityNetwork flow is an area of optimization theory concerned with optimization over networks with a range of applicability in fields such as computer networks, manufacturing, finance, scheduling and routing, telecommunications, and transportation. In both linear and nonlinear networks, a family of primal-dual algorithms based on "approximate" Complementary Slackness (ε-CS) is among the fastest in centralized and distributed environments. These include the auction algorithm for the linear assignment/transportation problems, ε-relaxation and Auction/Sequential Shortest Path (ASSP) for the min-cost flow and max-flow problems. Within this family, the auction algorithm is particularly fast, as it uses "second best" information, as compared to using the more generic ε-relaxation for linear assignment/transportation. Inspired by the success of auction algorithms, we extend them to two important classes of nonlinear network flow problems. We start with the nonlinear Resource Allocation Problem (RAP). This problem consists of optimally assigning N divisible resources to M competing missions/tasks each with its own utility function. This simple yet powerful framework has found applications in diverse fields such as finance, economics, logistics, sensor and wireless networks. RAP is an instance of generalized network (networks with arc gains) flow problem but it has significant special structure analogous to the assignment/transportation problem. We develop a class of auction algorithms for RAP: a finite-time auction algorithm for both synchronous and asynchronous environments followed by a combination of forward and reverse auction with ε-scaling to achieve pseudo polynomial complexity for any non-increasing generalized convex utilities including non-continuous and/ or non-differentiable functions. These techniques are then generalized to handle shipping costs on allocations. Lastly, we demonstrate how these techniques can be used for solving a dynamic RAP where nodes may appear or disappear over time. In later part of the thesis, we consider the convex nonlinear min-cost flow problem. Although E-relaxation and ASSP are among the fastest available techniques here, we illustrate how nonlinear costs, as opposed to linear, introduce a significant bottleneck on the progress that these algorithms make per iteration. We then extend the core idea of the auction algorithm, use of second best to make aggressive steps, to overcome this bottleneck and hence develop a faster version of ε-relaxation. This new algorithm shares the same theoretical complexity as the original but outperforms it in our numerical experiments based on random test problem suites

The distribution-free newsboy problem with resalable returns

We study the case of a catalogue/internet mail order retailer selling seasonal productsand receiving large numbers of commercial returns. Returned products arriving beforethe end of the selling season can be resold if there is sufficient demand. A single orderis placed before the season starts. Excess inventory at the end of the season is salvagedand all demands not met directly are lost. Since little historical information is available,it is impossible to determine the shape of the distribution of demand. Therefore, weanalyze the distribution-free newsboy problem with returns, in which only the mean andvariance of demand are assumed to be known. We derive a simple closed-form expressionfor the distribution-free order quantity, which we compare to the optimal order quantities whengross demand is assumed to be normal, lognormal or uniform. We find that the distribution-freeorder rule performs well in most realistic cases.inventory;product returns;distribution-free newsboy problem

An Economics-based Energy Account for Classical Mechanics

Simple operations transform Hamilton's equations for particle motion in classical mechanics into energy units. Then one obtains a single equation in location, location-changes, momenta and momenta-changes with the interpretation: income from capital, in units of energy, balances with current investment expenditure on location changes and momenta changes, also in units of energy. For the special case of periodic motion, the inflow-useflow sub-accounts for distinct position variables and for distinct momenta variables balance over the period of motionparticle dynamics, energy account

Old and new Italian multinational firms

After a quick profile of Italian foreign direct investments since 1900 and a short review of the main explanations of the lagged multinational growth by Italian manufacturing companies, a quick glimpse of business histories is given to the only two still today living "old protagonists" (Pirelli, Fiat) and to three old corporate groups (Olivetti, SNIA Viscosa, Montecatini-Montedison) who had also reached a significant degree of full internationalization early in the XX century, but during the second postwar period underwent profound dismantling of their original business mission. Finally the paper focuses on few cases of "new protagonists", mid-size family companies who undertook a true multinational strategy only in the most recent decades and today represent the core of the Italian "fourth capitalism".Italian industry-multinational companies

The Adam Klug Memorial Lecture: Haberler versus Nurkse: The Case for Floating Exchange Rates as an Alternative to Bretton Woods?

From the perspective of the late 1930s and 1940s the dominant view was that the inter-war currency experience was a financial disaster. The view is perfectly encapsulated in the League of Nations' publication The Inter-war Currency Experience, the bulk of which was written by Ragnar Nurkse and published in 1944. It was also the view behind the Keynes and White plans for international monetary reform, which culminated in the Bretton Woods conference and the establishment of the adjustable peg par value system buttressed by capital controls. An alternative view to Nurkse was posited by Gottfried Haberler in Prosperity and Depression, also commissioned by the League of Nations and published in 1937. In Prosperity and Depression Haberler made a strong intellectual case for floating exchange rates as a mechanism to insulate countries from the transmission of booms and depressions. In this paper we consider the views of Nurkse and Haberler on fixed and floating exchange rates and consider why Haberler's approach was not taken seriously until 1950s. Our main conclusion is that Haberler himself failed to offer a sufficiently clear blueprint for his approach at the time, although he did come to it by 1953. Moreover his views were counter to the ascending Keynesian paradigm.