Improving the productivity of vertisols in the Accra plains of Ghana using leguminous cover crops

The productivity of the Vertisols of the Accra plains is low, in spite of its high potential fertility. This could be attributed to physical constraints and low organic matter content. A study was conducted at the Agricultural Research Centre, Kpong, to assess the suitability of Mucuna pruriens, Mimosa invisa and Stylosanthes guianensis, in short fallows, for improving the fertility, physical properties, moisture conservation and weed control in the case of these soils. Mucuna had the highest biomass of 5.3tha^?1, as opposed to 4.1tha^?1 under natural fallow. The mucuna and stylosanthes biomass had comparatively higher total N values (240.75 and 203.51kgha^?1, respectively) than mimosa and natural fallow (152.46 and 162.74kgha^?1, respectively). Soil organic carbon, one year after the incorporation of cover crops, was found to be relatively higher under the cover crops (mucuna, stylosanthes and mimosa) than it was under natural fallow. Bulk densities were thus lower under the cover crops than they were under natural fallow. Also, soils under the cover crops had higher total porosity, water infiltration rates and moisture storage than they did under natural fallow. Weed cover, 115 days after planting maize, was significantly lower in plots previously under Mucuna pruriens than it was under natural fallow, Stylosanthes guianensis and Mimosa invisa. There was a negative linear correlation between cover crop biomass and weed density (R ² = 0.593–0.805). Grain and stover yields of maize were higher under Mucuna pruriens than they were under natural fallow (138 and 70 per cent higher, respectively). Burning of the natural fallow resulted in greater weed growth than when the material was worked into the soil (41 and 8 per cent, respectively). Grain yield was significantly greater under mucuna than it was under natural fallow (3.1 and 1.3tha^?1, respectively).     

The Medicare Electronic Health Records (EHR) Incentive Program: First-Year Adoption Response from Inpatient Hospitals

This study investigates electronic health records (EHR) adoption among inpatient hospitals in response to the first operational year of the Medicare EHR Incentive Program. Profile analysis of public attestation datasets finds both system adoption rates and implemented functionalities to have been significantly influenced by the incentive program’s attributes. Key dates and periods in the program’s well-publicized timeline were usually accompanied by spikes in the number of attested systems and/or dips in advanced functionalities. The implication is that hospitals have responded to the program by swiftly implementing EHR systems with capabilities just sufficient to meet program requirements, in order to be able to promptly file attestations and thus claim their incentive payments. The program therefore appears to have yielded mixed results. While it seems to have induced more hospitals to acquire EHR systems, the implemented systems generally possess minimal functionalities, suggesting that adopters have leveraged the program’s rules in order to maximize their own short-term gains.     

Discounts in Placing Pre-renounced Shares in Rights Issues

Abstract:  The paper presents evidence from UK rights issues on the discounts at which large blocks of new shares plus rights are sold. The shares are renounced by the shareholders entitled to them and placed with passive investors at substantial discounts of around 8% to the expected ex-rights midpoint price of the existing shares. Tests indicate that the discounts arise because of uncertainty about issuer value and inelastic demand for the shares rather than because the issuing companies are overvalued. The finding that selling renounced shares is costly removes an apparent advantage of rights issues compared with open offers and private placings.     

Discount rates for long-term projects: the cost of capital and social discount rate compared

Research on the cost of capital and on the social discount rate (SDR) has developed largely along separate paths. This paper offers an overview and comparison of both concepts. The consumption-based theory of discount rates is common to both, but there are striking differences in how the cost of capital and SDR are estimated. A project's cost of capital is inferred in practice from market data, by a well-established package of techniques, and project risk makes a large difference. In contrast, the SDR is estimated by applying judgement about the welfare of future generations, in the setting of consumption-based theory. Project risk has tended to be ignored under the SDR approach.     

The Elasticity of Taxable Income during the 1990s: New Estimates and Sensitivity Analyses

Over the past two decades, the elasticity of taxable income has emerged as the central parameter for assessing efficiency and revenue implications from changes to tax policy. This article estimates short‐ and longer‐run responses of taxable (and gross) income to changes in tax rates using panels of U.S. tax returns for the 1990s. With the richest set of income controls, income—weighted elasticity estimates range from 0.19 to 0.33, depending on whether responses are measured over one‐ or three‐year intervals. An alternative approach designed to capture delayed and anticipatory responses yields much larger estimates—ranging from 0.43 over the short term and from 0.78 to 1.46 over the longer term. A continuing obstacle to identification encountered here is that the income controls most likely to control for mean reversion and divergence within the income distribution are also the most likely to absorb independent variation in tax rates, also needed for identification.     

Are there arbitrage gaps in the UK gilt strips market?

Evidence in financial markets of an opportunity for pure arbitrage, and therefore a violation of the law of one price, is considered an anomaly to be noted. This paper reports an apparent violation of the law of one price between UK government gilts and their separately traded principal and coupon strips over a sample period of nearly 14 years. There are persistent price differences, and hence opportunities for arbitrage, after allowance for the bid-ask spread; the strips package tends to be overpriced in relation to the corresponding gilt. The price differences may, in part, be due to a lack of liquidity and stale prices in the strips market.     

THEORIES OF THE FIRM: IMPLICATIONS FOR STRATEGY RESEARCH*

Theories of the firm provide a perspective for thinking about organizational objectives and a framework for analysing important research problems. Here, we demonstrate the usefulness of several economic theories of the firm for guiding strategy research. We evaluate the relevance of each theory with regard to how the underlying conceptualization of the firm permits us to investigate issues of substantive interest to strategy researchers, and how compatible the assumptions contained within the theory are with the traditional strategy framework. We also examine the relevance of the theories from the viewpoint of philosophical methodology. We argue that, because of the integrative nature of strategy research, it is imperative for researchers to adopt multiple frameworks represented by different theories for the advancement of the field.     

Do Banks Follow Their Customers Abroad?

The market share of US business loans made by foreign‐owned banks has increased dramatically since 1980. At the same time, foreign direct investment in the US rose, so that much of the growth in foreign‐owned US‐based bank lending to businesses in the US could conceivably be accounted for by an increase in loans to the nonbank US affiliates of firms headquartered abroad, an expectation consistent with the conventional wisdom that banks "follow their customers" abroad. Our study investigates the lending patterns of US‐based banks from Japan, Canada, France, Germany, the Netherlands, and the UK, countries that account for the vast majority of foreign bank activity in the US. Simultaneously, we look at the borrowing patterns of nonbank US affiliates of firms from those countries. We find that banks from four of the six countries (Japan, Canada, the Netherlands, and the UK) allocated a majority of their loans to non‐home‐country borrowers for some or all of the 1981–1992 period. These findings suggest that the "follow the customer" hypothesis may have a more limited applicability than previously supposed.     

The selling and seasoning of investment company offerings

This article investigates the initial and subsequent pricing of Closed-End Investment Company (CEIC) shares offered to the public from 1986 through 1987. Unlike other equities, these showed no abnormal price appreciation at the offering; however, the new CEICs experience significant price declines in the 20 weeks following the offering. The evaporation of the initial premium begins approximately four weeks after the offering date, a lag that coincides with the period of time during which underwriters may cease supporting share prices in the secondary market.The authors thank John D. Jackson, Sam Peltzman, and two anonymous reviewers for their helpful comments.