A consumer really wants tickets to a concert, but because the concert is so popular, ticket prices are very high. Which factor best describes this effect on demand?
the number of consumers in the market
the availability of labor and materials
O a change in price of a substitute good
O a change in price of a complementary good

What is the difference between a journal entry written by an eyewitness to an event and a play written about the same event? a. the journal entry is a historiographical source, while the play is a periodical source. b. the journal entry is a chronological source, while the play is a primary source. c. the journal entry is a primary source, while the play is a secondary source. d. the journal entry is a secondary source, while the play is a periodical source.