According to the "rational expectations" school of thought in macroeconomics, the short-run Phillips curve is ________ in face of unanticipated changes in monetary policy

Children of female heads of households are five times more likely to live in poverty than other children

a. True b. False

When a firm is no longer able to reduce its long-run average cost by expanding, it has achieved its minimum efficient scale of production

a. True b. False