Tacit collusion occurs when price- and quantity-fixing agreements among producers

Because the price level does not affect the long-run determinants of real GDP, the long-run aggregate-supply curve is upward-sloping.

a. true b. false

From 1860 to 1910, U.S. mobility between social classes and occupations

(a) distracted immigrants. (b) increased the potential migrant's opportunity cost of staying in Europe. (c) attracted immigrants to the U.S. (d) decreased foreign investment in the U.S.