Nothing did more to accentuate these conflicts than the preposterous economic policy of the Polish Government. The Warsaw Diet of 1643, in endeavoring to determine the prices of various articles of merchandise, passed a law compelling all merchants to limit themselves by a public oath to a definite rate of profit, which was fixed at seven per cent in the case of the native Christian (_incola_), five per cent in the case of the foreigner (_advena_), and only three per cent in the case of the Jew (_infidelis_). It is obvious that, being under the compulsion of selling his goods at a cheaper price, the Jew on the one hand was forced to lower the quality of his merchandise, and on the other hand was bound to undermine Christian trade, and thereby draw upon himself the wrath of his competitors. As for the Polish clergy, true to its old policy it fostered in its flock the vulgar religious prejudices against the Jews. This applies, in particular, to the Jesuits, though, to a lesser degree, it holds good also in the case of the other Catholic orders of Poland. A frequent contrivance to raise the prestige of the Church was to engineer impressive demonstrations. In the spring of 1636, when a Christian child happened to disappear in Lublin, suspicion was cast upon the Jews, that they had tortured the child to death. The Crown Tribunal, which tried the case, and failed to find any evidence, acquitted the innocent Jews. Thereupon the local clergy, dissatisfied with the judgment of the court, manufactured a new case, this time with the necessary "evidence." A Carmelite monk by the name of Peter asserted that the Jews, having lured him into a house, told a German surgeon to bleed him, and that his blood was squeezed out and poured into a vessel, while the Jews murmured mysterious incantations over it. The Tribunal gave credit to this hideous charge, and, after going through the regular legal proceedings, including the medieval "cross-examinations" and the rack, sentenced one Jew named Mark (Mordecai) to death. The Carmelite monks hastened to advertise the case for the purpose of planting the terrible prejudice more firmly in the hearts of the people.