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An electron donating group (EDG) or electron releasing group (ERG, Z in structural formulas) is an atom or functional group that donates some of its electron density into a conjugated π system via resonance (mesomerism) or inductive effects (or induction)—called +M or +I effects, respectively—thus making the π system more nucleophilic.
Delocalizing the radical ion stabilizes the transition state structure. As a result, the energy of activation decreases, enhancing the rate of the overall reaction. According to the captodative effect, the rate of a reaction is the greatest when both the EDG and EWG are able to delocalize the radical ion in the transition state structure. [7]
A textbook in 22 chapters that provides a complete introduction to economics and is used in approximately 500 universities worldwide. This economics textbook was designed as the source material for taught courses in the first year of an undergraduate degree, although it has also been used in schools, and for advanced courses in public policy.
The book showed how operationally meaningful theorems can be described with a small number of analogous methods, thus providing "a general theory of economic theories." It moved mathematics out of the appendices (as in John R. Hicks's Value and Capital ) and helped change how standard economic analysis across subjects could be done with the ...
The endogenous growth theory primarily holds that the long run growth rate of an economy depends on policy measures. For example, subsidies for research and development or education increase the growth rate in some endogenous growth models by increasing the incentive for innovation.
An electric effect influences the structure, reactivity, or properties of a molecule but is neither a traditional bond nor a steric effect. [1] In organic chemistry, the term stereoelectronic effect is also used to emphasize the relation between the electronic structure and the geometry (stereochemistry) of a molecule.
The Edgeworth box is named after Francis Ysidro Edgeworth, [4] who presented it in his book Mathematical Psychics: An Essay on the Application of Mathematics to the Moral Sciences, 1881. [5] Edgeworth's original two-axis depiction was developed into the now familiar box diagram by Pareto in his 1906 Manual of Political Economy and was ...
Chapter 25, "A Note on Books", recommends several books for those interested in further reading on economics. He suggests some intermediate-length works, such as Frederic Benham's "Economics" and Raymond T. Bye's "Principles of Economics," as well as older books like Edwin Canaan's "Wealth" and John Bates Clark's "Essentials of Economic Theory."
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