Considering the reciprocal nature of rights and responsibilities, if an employee has the right to a safe working environment, then the employer has . a. a duty to enforce the right only if it is mentioned in the employment contract b. an obligation to improve working conditions to fulfill that right c. the right to demand compliance with everything the company asks for d. the right to terminate employees in case of workplace injuries

Which of the following statements is (are) true? i. free entry to a perfectly competitive industry results in the industry's firms earning zero economic profit in the long run, except for the most efficient producers, who may earn economic rent. ii. in a perfectly competitive market, long-run equilibrium is characterized by lmc < p < latc. iii. if a competitive industry is in long-run equilibrium, a decrease in demand causes firms to earn negative profit because the market price will fall below average total cost.