4.During some period of time it is observed that the price of prerecorded cassette tapes has fallen but the quantity bought and sold has remained about constant. The best explanation for this is:
  1. Manufacturing costs of cassette tapes have fallen and the price of compact disks (CDs) has risen.
  2. Manufacturing costs of cassette tapes have fallen and the price of CDs has fallen.
  3. Manufacturing costs of cassette tapes have risen and the price of CDs has fallen.
  4. Manufacturing costs of cassette tapes have risen and the price of CDs has risen.
  5. Manufacturing costs of cassette tapes have fallen and the price of tape decks has fallen.


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