Instructions: Imagine four adults and tell what each can gain by trading with the others. The best answer would include something quantitative, i.e. try to measure the values of what each person might gain by trading. Abe is a 75-year-old retired professor. He has a doctorate in history, and taught that subject for thirty years at a university. He has much knowledge, but little energy. Now, he has health problems, but he is not poor because he saved part of his salary for decades and now has over $1 million in the bank. Brittany is a 35-year-old nurse who chooses to stay at home and raise her five children instead of having a job. Her car is old and she fears that it will break down, but she cannot afford to buy a new one. Charlie is a 19-year-old college student studying history. He drives an uber to earn some money, but he does not earn much. He is poor, but young and full of energy. Dianne is a 45-year-old mechanic who is highly skilled at repairing all kinds of vehicles. She would like to get a college degree, but she does not have time to attend classes