Research examining home-school cooperation has identified several barriers to parental involvement in school activities. which of the following are most commonly identified as these barriers? 1. economic barriers, such as parents holding more than one job, and lacking resources such as child care or transportation to and from school2. attitude barriers, such as parents feeling home-school cooperation is unnecessary, because home is the place where students spend most of their time.3. cultural barriers, such as parents having attended schools that were very different from the ones their children are now attending.4. language barriers, such as children coming from homes where the first language is not english. a. 1, 2, 3, 4 b. 2, 3, 4 c. 1, 3, 4 d. 1, 2, 4 e. 1, 2, 3

1. consider a two-firm industry. firm 1 (the incumbent) chooses a level of output qı. firm 2 (the potential entrant) observes qı and then chooses its level of output q2. the demand for the product is p 100 q, where q is the total output sold by the two firms which equals qi +q2. assume that the marginal cost of each firm is zero. a) find the subgame perfect equilibrium levels of qi and q2 keeping in mind that firm 1 chooses qi first and firm 2 observes qi and chooses its q2. find the profits of the two firms-n1 and t2- in the subgame perfect equilibrium. how do these numbers differ from the cournot equilibrium? b) for what level of qi would firm 2 be deterred from entering? would a rational firm 1 have an incentive to choose this level of qi? which entry condition does this market have: blockaded, deterred, or accommodated? now suppose that firm 2 has to incur a fixed cost of entry, f> 0. c) for what values of f will entry be blockaded? d) find out the entry deterring level of q, denoted by q1', a expression for firm l's profit, when entry is deterred, as a function of f. for what values of f would firm 1 use an entry deterring strategy?