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4) In the US, the unemployment rate was 5%, and inflation was 2%. Two years later, the unemployment rate is down to 3.9%, and inflation is still 2%. What number might be the natural rate of unemployment in the US? (2 points) a) 5% 6% C) 3% d) All of these numbers could be the natural rate of unemployment e) None of these could be the natural rate of unemployment 5) In the economy of Trantor, TOR is a very important resource. People in Trantor use 1,000 tons of TOR per year, and scientists believe there are 40,000 tons of TOR left in the world. Which of the following is most accurate? (2 points) a) In 40 years, Trantor is going to run out of Tor for sure. b) There's no way Trantor could run out of Tor, because as Tor becomes scarce, the price of Tor will rise, and then people will use less and produce more and invent alternatives. c) Trantor might not run out of TOR. It depends how easy it is to invent alternatives to TOR when the price rises, and to how easy it is to use less TOR when the price rises. d) All of these are true e) None of these are true 6) What is the main argument economists make for not letting politicians control the central bank? (2 points) a) Government is inefficient, so the central bank would be less profitable if the government was running it. b) If politicians controlled central banks, they would want to lower interest rates before every election. This would create inflation. c) Actually, almost all economists want politicians to be control the central bank d) All of these are true e) None of these are true