I have a problem in economics on Market Supplies of Labor. Please help me in the following question. In long run, the labor supply curve facing the major industry: (i) Will always be positively associated to the wage rate. (ii) Will slope upward if and only if individual labor supply curves slope upward. (iii) Can be backward bending at much high wage rates. (iv) Is the horizontal summation of the individually derived supply curves.
Choose the appropriate answer from above.