A family has a target of $1500 for the income that it needs to earn each week. Both adults in the family work at ?exible jobs where they have a choice over how many hours to work. They decide that the relative number of hours they should work should be equal to the ratio of their hourly wage rates. The female earns $20 an hour and the male $15. How many hours does each of them work? What happens when the female gets a 20% wage rise to $24 an hour? What happens if both adults get a 20% pay rise? What does this imply about their income and substitution effects?