Sharing and exchange are common practices for minimizing food insecurity in rural populations. The advent of markets and monetization in egalitarian indigenous populations presents an alternative means of managing risk, with the potential impact of eroding traditional networks. We test whether market involvement buffers several types of risk and reduces traditional sharing behavior among Tsimane Amerindians of the Bolivian Amazon. Results vary based on type of market integration and scale of analysis (household vs. village), consistent with the notion that local culture and ecology shape risk management strategies. Greater wealth and income were unassociated with the reliance on others for food, or on reciprocity, but wealth was associated with a greater proportion of food given to others (i.e., giving intensity) and a greater number of sharing partners (i.e., sharing breadth). Across villages, greater mean income was negatively associated with reciprocity, but economic inequality was positively associated with giving intensity and sharing breadth. Incipient market integration does not necessarily replace traditional buffering strategies but instead can often enhance social capital.

The effective use of any medical imaging modality and the interpretation of images requires some understanding of the physical principles of the image formation process. This is because the ability to visualize specific anatomical structures or pathologic conditions depends on the inherent characteristics of a particular modality and the set of imaging factors selected by the user. The relationship between visibility and imaging factors is rather complex and often involves compromises and trade-offs among the different aspects of image quality. All imaging methods deposit some form of energy in the patient's body. This is not always without risk. Radiation exposure is usually a variable factor and often has an effect on image quality. An optimized image procedure is one in which these two factors- image quality and radiation exposure-are properly balanced. This book provides the physics and scientific knowledge that enables the physician to make appropriate technical decisions in all phases of the imaging process. It is written primarily for the physicians studying in a radiology residency program and is also a useful reference for the practicing radiologist who is often faced with day-to-day decisions concerning imaging equipment, procedures, and patient safety. This text contains much of the material from the author's previous books: The Physical Principles of Diagnostic Radiology, The Physics and Instrumentation of Nuclear Medicine, and the first edition of Physical Principles of Medical Imaging and it has been updated and supplemented especially in the areas of ultrasound, emission tomography and magnetic resonance imaging. The selection of topics and presentation of concepts is based on the physics component of the radiology residency program at Emory University. It assumes no previous knowledge of physics but rather a sincere desire on the part of the reader to understand the physical principles of the medical imaging profession.

This policy brief, which is based on an internal memo, summarizes the institutional and operational features observed in the 27 countries that have gained experience with inflation targeting (IT). It finds considerable convergence in many IT practices across countries over the past 10 to 15 years but much variation in policymakers ’ choices concerning such key issues as how they treat the borders of the target range. On the whole, most IT banks have chosen to practice inflation targeting in a more flexible and, thus, resilient fashion than many analysts once feared—seemingly without much loss of credibility. Currently, however, after a prolonged period of rapidly rising commodity and asset prices, followed by a period of sharp oil and asset price declines, IT is clearly facing the greatest challenges in its short history of relatively widespread use. Fortunately, one key lesson that emerges from our experience to date is that much of the ability of inflation targeting to help moor inflation expectations likely stems from the premium it places on improving transparency standards. These standards are available to all central banks, whether they choose to practice inflation targeting or not.

The application of neuroimaging methods to product marketing — neuromarketing — has recently gained considerable popularity. We propose that there are two main reasons for this trend. First, the possibility that neuroimaging will become cheaper and faster than other marketing methods; and second, the hope that neuroimaging will provide marketers with information that is not obtainable through conventional marketing methods. Although neuroimaging is unlikely to be cheaper than other tools in the near future, there is growing evidence that it may provide hidden information about the consumer experience. The most promising application of neuroimaging methods to marketing may come before a product is even released — when it is just an idea being developed.