Can someone please help me in finding out the accurate answer from the following question. According to most conventional theories of labor market: (1) The supply curve of labor is positively sloped as higher salaries attract the extra workers to the labor market. (2) Firms should contend with rising returns from the additional employment. (3) Firms can decrease money wages to the subsistence levels as workers depend on the jobs for income. (4) Unemployed people threaten to the job security of employed, pressuring salaries downwards towards subsistence level.