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Volume	Vol 29, nº 4, Out-Dez - 2009
Author	Fabrício Leite, Gustavo Aggio e Eduardo Angeli
Section	Debate
Paper	Comentário a "Matemática Agradável", de Gerson Lima
Summary	The paper aims at analyzing the article by Gerson Lima on the manner by which fiscal deficit should be covered. It presents a more general dynamic model, where the principle of effective demand is explicitly used. By doing that, it is possible to treat as endogenous variables the national income and the government entries, what brings the result that the public debt must not follow an explosive path unless the very restrictive conditions of Lima's paper prevail. It also evaluates Lima's implicit inflation theory, and argues against his approximation to Friedman's framework.