Which of the following is NOT one of the factors that influences the supply of a product?

Which of the following is most likely to be an example of causation?

A) A student wins money by scratching a ticket with a particular coin. He decides to scratch all tickets with the same coin in the future. B) A soccer player scores 4 goals when he wears red socks. He concludes that the red socks helped him score the goals. C) A firm producing CFLs installs new machinery. The per-day production of CFLs increases. D) The crime rate is high in a country. The literacy rate is high as well.

__________ trading volume promotes __________ bid-asked spreads

A) Large; wide B) Large; narrow C) Small; narrow D) None of the above.