As incomes rise, the young farmer buys a truck to replace his father's trusty donkey, or he gives up farming altogether to open a bar or car-rental office.
The young farmer would do better to stay in the farming business.
mnli hypothesis: The young farmer would do better to stay in the farming business. premise: As incomes rise, the young farmer buys a truck to replace his father's trusty donkey, or he gives up farming altogether to open a bar or car-rental office.