Background: Dame Agatha Mary Clarissa Christie, Lady Mallowan, (nee Miller; 15 September 1890 - 12 January 1976) was an English writer. She is known for her 66 detective novels and 14 short story collections, particularly those revolving around her fictional detectives Hercule Poirot and Miss Marple. Christie also wrote the world's longest-running play, a murder mystery, The Mousetrap, and six romances under the name Mary Westmacott. In 1971 she was appointed a Dame Commander of the Order of the British Empire (DBE) for her contribution to literature.
Context: Christie occasionally inserted stereotyped descriptions of characters into her work, particularly before the end of the Second World War (when such attitudes were more commonly expressed publicly), and particularly in regard to Italians, Jews, non-Europeans, and sometimes Americans, the last usually as impossibly naive or uninformed. For example, she described "Hebraic men with hook-noses wearing rather flamboyant jewellery" in the first editions of the collection The Mysterious Mr Quin (1930), in the short story "The Soul of the Croupier"; in later editions, the passage was edited to describe "sallow men" wearing same. In The Hollow, published as late as 1946, one of the more unsympathetic characters is "a Whitechapel Jewess with dyed hair and a voice like a corncrake ... a small woman with a thick nose, henna red and a disagreeable voice". To contrast with the more stereotyped descriptions, Christie sometimes showed "foreigners" as victims or potential victims at the hands of English malefactors, such as, respectively, Olga Seminoff (Hallowe'en Party) and Katrina Reiger (in the short story "How Does Your Garden Grow?"). Jewish characters are often seen as un-English (such as Oliver Manders in Three Act Tragedy), but they are rarely the culprits. Often, she is affectionate or teasing with her prejudices. After four years of war-torn London, Christie hoped to return some day to Syria, which she described as "gentle fertile country and its simple people, who know how to laugh and how to enjoy life; who are idle and gay, and who have dignity, good manners, and a great sense of humour, and to whom death is not terrible." She had trouble with an incompetent Swiss French nursery helper (Marcelle) for toddler Rosalind, and as a result she decided, "Scottish preferred ... good with the young. The French were hopeless disciplinarians ... Germans good and methodical, but it was not German that I really wanted Rosalind to learn. The Irish were gay but made trouble in the house; the English were of all kinds".
Question: Why is it an unsympathetic character?
Answer: dyed hair and a voice like a corncrake ... a small woman with a thick nose, henna red and a disagreeable voice".

Background: Irving Fisher (February 27, 1867 - April 29, 1947) was an American economist, statistician, inventor, and Progressive social campaigner. He was one of the earliest American neoclassical economists, though his later work on debt deflation has been embraced by the Post-Keynesian school. Joseph Schumpeter described him as "the greatest economist the United States has ever produced", an assessment later repeated by James Tobin and Milton Friedman. Fisher made important contributions to utility theory and general equilibrium.
Context: James Tobin argued that the intellectual breakthroughs that marked the neoclassical revolution in economics occurred in Europe around 1870. The next two decades witnessed lively debates, which led to the new theory being more or less incorporated into the classical tradition that preceded it. In the 1890s, according to Joseph A. Schumpeter there emerged A large expanse of common ground and ... a feeling of repose, both of which created, in the superficial observer, an impression of finality - the finality of a Greek temple that spreads its perfect lines against a cloudless sky. Of course, Tobin argues, the temple was by no means complete. Its building and decoration continue to this day, even while its faithful throngs worship within. American economists were not present at the creation. To a considerable extent they built their own edifice independently, designing some new architecture in the process. They participated actively in the international controversies and syntheses of the period 1870-1914. At least two Americans were prominent builders of the "temple," John Bates Clark and Irving Fisher. They and others brought neoclassical theory into American journals, classrooms, and textbooks, and its analytical tools into the kits of researchers and practitioners. Eventually, for better or worse, their paradigm would dominate economic science in this country. In reviewing the history of utility theory, economist George Stigler wrote that Fisher's doctoral thesis had been "brilliant" and stressed that it contained "the first careful examination of the measurability of the utility function and its relevance to demand theory." While his published work exhibited an unusual degree of mathematical sophistication for an economist of his day, Fisher always sought to bring his analysis to life and to present his theories as lucidly as possible. For instance, to complement the arguments in his doctoral thesis, he built an elaborate hydraulic machine with pumps and levers, allowing him to demonstrate visually how the equilibrium prices in the market adjusted in response to changes in supply or demand.
Question: How did he augment the arguments?
Answer:
he built an elaborate hydraulic machine with pumps and levers, allowing him to demonstrate visually how the equilibrium prices in the market