Joe Blow has operated an apple orchid for over 40 years. He sells his apples to juice makers and wholesalers. Mr. Blow has been able to make a decent living despite the ups and downs in the industry. He loves growing apples. His son stands ready to take over the operation whenever Mr. Blow wants to retire. Mr. Blow has said for the past 10 years that he'd give the farm to his son and retire if he earned less than $35,000 per year. When he retires, he expects to have and annual income of $35,000. a. For the past 4 years, Joe Blow earned $45,000 a year operating the farm. Explain whether he earned any economic profit over that period? b. Calculate the economic profit or loss (if any) for Joe Blow in part a