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The present report describes an operant procedure for the assessment of grating acuity in young and/or developmentally delayed children. Prior to testing, the child was trained to point to a grating presented on one of two equally bright screens. A reward was given to the child for each correct response. During the test, the gratings became progressively(More)
1 This open-access article is published and distributed under the Creative Commons Attribution-NonCommercial-No Derivatives License which permits the noncommercial use, distribution, and reproduction of the article in any medium, provided the original author and source are credited. You may not alter, transform, or build upon this article without the(More)
We find a limited parallel between lump-sum taxes and environmental taxes. Corollary 2, which extends Sandmo's observation, shows that appropriated corrective revenues have the same non-distortionary effects as lump-sum taxes, the result reducing to the original observation when the appropriated corrective revenues meet the revenue need and achieve(More)
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