Front matter 40(1)

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The Baryonic and Dark Matter Distributions in Abell 401

We combine spatially resolved ASCA temperature data with ROSAT imaging data to constrain the total mass distribution in the cluster A401, assuming that the cluster is in hydrostatic equilibrium, but without the assumption of gas isothermality. We obtain a total mass within the X-ray core (290 h−1 50 kpc) of 1.2 −0.5×10 h−1 50 M at the 90 % confidence level, 1.3 times larger than the isothermal ...

01 Front Matter (i-vi)

Anthropic bias : observation selection effects in science and philosophy / by Nick Bostrom. p. cm. — (Studies in philosophy) Includes bibliographical references and index.

Front Matter, Table of Contents

Does front-loading taxation increase savings? Evidence from Roth 401(k) introductions.

Can governments increase private savings by taxing savings up front instead of in retirement? Roth 401(k) contributions are not tax-deductible in the contribution year, but withdrawals in retirement are untaxed. The more common before-tax 401(k) contribution is tax-deductible in the contribution year, but both principal and investment earnings are taxed upon withdrawal. Using administrative dat...