If one of the prices changes relative to the price of another the budget line changes slope and the new bundle of goods is along the same indifference curve but a different bundle tangent to new line. It might be that the demand for charity which is included in our definition of leisure simply outweighs their cost of not working. Since a rising wage rate raises incomes all else constant the attraction of unpaid time rises eventually neutralising the substitution effect and causing the backward bend.
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