BIOLOGICAL NITROGEN FIXATION—EARLY AMERICAN STYLE

Pricing American-style securities using simulation

We develop a simulation algorithm for estimating the prices of American-style securities, i.e., securities with opportunities for early exercise. Our algorithm provides both point estimates and error bounds for the true security price. It generates two estimates, one biased high and one biased low, both asymptotically unbiased and converging to the true price. Combining the two estimators yield...

Attributional style of African-American adolescents

American-style Indexed Executive Stock Options

This paper develops a new pricing model for American-style indexed executive stock options. We rely on a basic model framework and an indexation scheme first proposed by Johnson and Tian (2000a) in their analysis of European-style indexed options. Our derivation of the valuation formula represents an instructive example of the usefulness of the change-of-numeraire technique. In the paper’s nume...

The patchwork: Health reform, American style.

0277-9536/$ e see front matter 2010 Elsevier Ltd. doi:10.1016/j.socscimed.2010.10.016 American health care rightly has been characterized as a “paradox of excess and deprivation” (Enthoven & Kronick, 1989, p. 29). The United States spends more on medical care than any country in the worlddover $2.5 trillion or 17% of its gross domestic product as of 2009. At the same time, the U.S. is the only ...

Biological nitrogen fixation, 1924-1974.

Crop rotation was practiced in ancient times by alternating the use of leguminous and nonleguminous plants. The basis for the benefit derived from this practice was not understood, but it was observed empirically that crops were improved and the condition of the soil was maintained better with rotation than by continual cropping with nonleguminous plants. Rotation was recognized as good husband...