the supply curve for a market. There are two cases to consider. First,
camo oakley sunglasses, we examine a
                                          market with a fixed number of firms. Second,
true religion jeans sale, we examine a market in which the
                                          number of firms can change as old firms exit the market and new firms enter. Both
                                          cases are important,
true religion jeans wholesale, for each applies over a specific time horizon. Over short peri-
                                          ods of time,
cheap p90x workout, it is often difficult for firms to enter and exit, so the assumption of a
                                          fixed number of firms is appropriate. But over long periods of time,
mulberry alexa clutch, the number of
                                          firms can adjust to changing market conditions.
                                          T H E S H O R T R U N : M A R K E T S U P P LY W I T H
                                          A FIXED NUMBER OF FIRMS