PORTFOLIO INSURANCE AND VOLATILITY REGIME SWITCHING

A new equilibrium model of portfolio insurance is presented in order to study the volatility effects of dynamic insurance strategies. While prior research has focused on the relationship between portfolio insurance and the overall level of market volatility, this article shows that the salient feature of portfolio insurance is volatility regime switching. Regime switching is shown to be a necessary condition for portfolio insurance, which provides a new explanation for the pervasive volatility clustering effect that is found in most equity markets. The equilibrium involves a free boundary and the local time of the equilibrium price process at the free boundary plays an important role in solving the model.     

Identification and estimation of statistical functionals using incomplete data

Incomplete data, due to missing observations or interval measurement of variables, usually cause parameters of interest in applications to be unidentified except under untestable and often controversial assumptions. However, it is often possible to identify sharp bounds on parameters without making untestable assumptions about the process through which data become incomplete. The bounds contain all logically possible values of the parameters and can be estimated consistently by replacing the population distribution of the data with the empirical distribution. This is straightforward in some circumstances but computationally burdensome in others. This paper describes the general problem and presents an empirical illustration.     

Taxes and the User Cost of Capital for Owner-Occupied Housing

Owner-occupied housing is said to be favored in the tax code because the return on owner's equity is not taxed and mortgage interest and property taxes can be deducted in the computation of one's income tax base. The special tax treatment reduces the user cost of capital for owner-occupied housing.
The issue treated in this paper is the measurement of the tax rate to be employed in the user cost calculations. It is argued that different tax rates are appropriate for the tenure choice and quantity-demanded decisions, and that these values depend on the detailed tax position of the household and the method of finance. Average 1977 tax rates for household in different income ranges are calculated using the NBER TAXSIM microeconomic data file on individual tax returns.     

Physical energy cost serves as the “invisible hand” governing economic valuation: Direct evidence from biogeochemical data and the U.S. metal market

Energy supply is mandatory for the production of economic value. Nevertheless, tradition dictates that an enigmatic “invisible hand” governs economic valuation. Physical scientists have long proposed alternative but testable energy cost theories of economic valuation, and have shown the gross correlation between energy consumption and economic output at the national level through input-output energy analysis. However, due to the difficulty of precise energy analysis and highly complicated real markets, no decisive evidence directly linking energy costs to the selling prices of individual commodities has yet been found. Over the past century, the US metal market has accumulated a huge body of price data, which for the first time ever provides us the opportunity to quantitatively examine the direct energy-value correlation. Here, by analyzing the market price data of 65 purified chemical elements (mainly metals) relative to the total energy consumption for refining them from naturally occurring geochemical conditions, we found a clear correlation between the energy cost and their market prices. The underlying physics we proposed has compatibility with conventional economic concepts such as the ratio between supply and demand or scarcity's role in economic valuation. It demonstrates how energy cost serves as the “invisible hand” governing economic valuation. Thorough understanding of this energy connection between the human economic and the Earth's biogeochemical metabolism is essential for improving the overall energy efficiency and furthermore the sustainability of the human society.     

Determinants of Success of Employer Branding in a Start‐up Firm in Nigeria

This article aims at providing an understanding of factors that determine the success and failure of employer branding. An African steel‐producing start‐up company developed an employer brand image, which enabled it to effectively attract and hire talent from the labor market and inspired high engagement and productivity. A few years later, the firm lost its attractive brand image and its employer brand loyalty also declined. The study is a longitudinal investigation, and data were collected from policies and through structured interviews with the employees, ex‐employees of the organization, and prospective employees. Findings show amazing success of the employer brand in the first six years in talent attraction, hiring, engagement, and retention. Thereafter, the brand lost its potency, and its dysfunctionality significantly impacted on the future of the firm—employee dissatisfaction, decline in productivity, and increase in turnover. The reasons include a toxic organizational environment, overbranding, failure to keep promises, disconnect between employer branding and human resource strategy, shift of emphasis by senior management from people to production, and lack of a dynamic and differentiated employee value proposition. The study offers practical lessons to managers. © 2017 Wiley Periodicals, Inc.     

Throwing the Books at Them: Amazon's Puzzling Long Run Pricing Strategy

Firms competing for consumers to adopt new platforms have incentives to charge low prices to promote adoption, followed by higher prices later on. This study explores Amazon's dynamic pricing strategy by comparing its contemporary pricing on e‐books, a relatively new product with complementary hardware and switching costs, with its pricing on physical books, a now‐mature product without complementary hardware or switching costs. Using over 150,000 hourly observations on prices and sales ranks for electronic and physical bestseller books between 2012 and 2013, in conjunction with actual quantity data, we estimate the price elasticities of demand for books at Amazon. Despite inherent challenges in data availability and measurement, we find it surprising that both electronic and physical book prices fall substantially short of the static profit maximizing level two decades after Amazon's launch. These findings raise questions for both policymakers and shareholders.     

The tradeoff between risk sharing and information production in financial markets

The production of information in financial markets is limited by the extent of risk sharing. The wider a stock's investor base, the smaller the risk borne by each shareholder and the less valuable information. A firm which expands its investor base without raising capital affects its information environment through three channels: (i) it induces incumbent shareholders to reduce their research effort as a result of improved risk sharing, (ii) it attracts potentially informed investors, and (iii) it may modify the composition of the base in terms of risk tolerance or liquidity trading. Implications for individual firms and the market as a whole are derived.     

Music file sharing and sales displacement in the iTunes era

A growing empirical literature examines the relationship between music file sharing and legal purchases of music, but existing studies examine the period before consumers had attractive legal digital a la carte options. The iTunes Music Store has grown quickly since its appearance in 2003, and digital music now accounts for a third of US recorded music sales. Using two new surveys of University of Pennsylvania undergraduates in 2009 and 2010, we ask how music file sharing and sales displacement operate in the iTunes era, when the alternative to file sharing is purchasing individual songs, rather than entire albums. We find large amounts of file sharing in this population. Respondents have more stolen than paid music, but the music obtained via file sharing is, for the most part, low-valuation music which the respondents would likely not have purchased. The rate of sales displacement implied by the relationship between stolen and purchased music across respondents in both samples is between −0.15 and −0.3. That is, an additional song stolen reduces paid consumption by between a third and a sixth of song. Perhaps surprisingly, this is about the same as the CD sales displacement rate found for the pre-iTunes era using a similar empirical approach on a similar study population.     

Diversity in trade union membership: a typology based on the study of a Spanish trade union

While existing literature on the changing nature of trade union membership concentrates on unidimensional differences between members, this article proposes a multidimensional typology, which considers demographic characteristics as well as labour market position and length of union membership. Our results allow the identification of different member profiles; these are significantly associated to differences in employment conditions, work participation, job satisfaction and union activism. In the last section of the article, we discuss the practical implications that these different member profiles may have for union policy and organisation.