Question

How might the economic situation of a country contribute to the popularity of drinking tap water that comes from treated wastewater?

Answer 1

During positive GDP growth or a boom, incomes are high and therefore so also is disposable income, this makes people more likely to purchase normal goods such as bottled water

During negative economic growth or a recession, reduced incomes result in the increased sale of inferior good which include tap water. don't write this word for word obviously but here you go :)