The most serious problem with aggression is that a. we aim it at people or things that aren't the cause of our frustration. b. it's sometimes necessary to change our goals. c. it can cause property damage. d. we remove the obstacle that's the cause of our frustration.

Trade will take place: a. if the maximum that a consumer is willing and able to pay is less than the minimum price the producer is willing and able to accept for a good. b. if the maximum that a consumer is willing and able to pay is greater than the minimum price the producer is willing and able to accept for a good. c. only if the maximum that a consumer is willing and able to pay is equal to the minimum price the producer is willing and able to accept for a good. d. none of the above.