Which of the following is an example of heterogeneity of services? a. The packaging of the pizza that I ordered today had a very different design and was made of recyclable paper. b. The tire I bought at a Chicago service station came with a discount but lasted as long as another other tire. c. The surgical instruments that doctors use in a New York hospital are the same as those used by doctors in the Miami hospital where I was examined. d. The customer service agent who contacted me last week was more helpful than the one who contacted me today.

The former chairman of the federal reserve, alan greenspan, used the term "irrational exuberance" in 1996 to describe the high levels of optimism among stock market investors at the time. stock market indexes such as the s& p composite price index were at an all-time high. some commentators believed that the fed should intervene to slow the expansion of the economy. why would central banks want to clamp down when the economy is growing? a. to block the formation of unsustainable speculative asset bubbles. b. to curtail excessive profits in the banking system. c. to prevent inflationary forces from gathering momentum. d. all of the above. e. a and c only.