Final answer:
The question lacks the necessary details to calculate the earnings of Sandy Denny and George Barney. It does introduce a separate scenario involving Susan and examines the relationship between work and government support, emphasizing the concepts of incentive and opportunity cost.
Step-by-step explanation:
To calculate the total amount earned by Sandy Denny and George Barney during fair time, one would need additional information, such as the number of hours each individual worked. The initial question does not provide this information, making it impossible to give a direct answer in two lines or a main answer in 200 words. The details about Susan, a single mother, and her work choices versus government benefits is a scenario related to economics, showing how income affects government support and total income, and the impact of these factors on work incentives. To fully answer the original question about Sandy Denny and George Barney, the number of hours worked needs to be clarified.
Incentives to work and opportunity costs are important concepts when analyzing the decision-making process for individuals like Susan. The reduction in government support relative to income earned could discourage work, while other factors such as child care, transportation, and job satisfaction could also play roles in her decision to work more or fewer hours.