Seja o processo auto-regressivo: !$ y_t=Φ _1 y_{t-1} + ε _t !$. Pode-se afirmar que:

Item 1: Se !$ Φ_1 =1 !$, , o processo é dito um caminho aleatório (random walk)

Sobre a controvérsia entre Novos Keynesianos e Novos Clássicos, indique se a afirmação é falsa ou verdadeira:

Item 1: A hipótese dos custos de menu argumenta que firmas atuando em competição monopolista aumentam seus preços mesmo quando as variações nos custos de menu são pequenas

FIRST TEXT

Sympathetic writers talk of Marx’s passionate empathy toward the working class, his demands for a decent wage and improved working conditions, and his great feeling for his family’s welfare. In this respect, Marx is an enigma. In the classroom’s most popular book on the history of economics, Robert L. Heilbroner writes that, despite his reputation as a contentious and vengeful man who feuded constantly with his contemporaries, Marx was a devoted husband and father. In a sympathetic biography, Saul K. Padover notes, “Marx, the harsh critic and angry radical in his public life and writings, was a different man in private. In his personal life, he was extraordinarily kind and generous and, when not tormented by illnesses, gay. . . . [As a] self-assured male, Marx has a genuine affection and esteem for women. . . . [And] Jenny was the only woman in his life.”

Apologists for Marx are almost always blind to the darker side of the creator of communism. They write of his devotion to his family and his love letters to his wife but ignore or condone his illicit affair with the family’s household servant, Lenchen, which produced an illegitimate son whom Marx would have nothing to do with. Interestingly, Marx also never paid this servant a penny for her housework.

Karl and Jenny Marx were poverty-stricken but not for want of money. They received large sums over the years from Engels, other supporters, and from Marx’s writings. One estimate is that Marx was poor only 15 years of his 65-year career, and that his income placed him in the top 5 percent of London residents in the 1860s. But the Marxes were financially incompetent and could not control their spending habits. Marx entertained lavishly, speculated on the stock market, and spent large sums on liquor, books, travel, and other consumer goods until he had to beg for more or borrow from pawnshops at usury rates. Such irresponsible spending habits often left his family starving, destitute, and in ill health. Marx’s family life was often a nightmare, resulting in the early death or eventual suicide of most of his children. Historian Robert Payne, in his biography of Marx, concludes, “He exploited everyone around him – his wife, his children, his mistress and his friends – with a ruthlessness which was all the more terrible because it was deliberate and calculating.” (“Was Marx a Good Family Man?” Skousen, Marx, Economics on Trial: Lies, Myths, and Realities. Business One Irwin, Homewood, Ill, 1991: 212-213).

According to the text, Marx:

Item 1:was a profligate spender.