Which of the following events would shift a labor supply curve?

Question

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(i) An increase/decrease in the number of workers or hours worked per day would shift the labor supply curve to the right/left.
(ii) An increase/decrease in wages of a substitute occupation (e.g., nurses' wages increasing and attracting workers away from teaching) would shift the labor supply curve to the left/right.
(iii) A change in the government policy that affects the cost and availability of child care (e.g., government-subsidized child care becoming available) would shift the labor supply curve to the right/left.

Which of the Following Events Would Shift a Labor Supply