What is anti-Semitism. Why were people so anti-Jewish? What kind of advertising, advertisements, books, pieces and / or "scientific" articles were
created to justify people's hatred?

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need