The textbook discusses two different kinds of isolating mechanisms: impediments to imitation (denote this IMI) and early mover advantage (denote this EMA). According to the textbook, each item that is listed below is an isolating mechanism. With each item, indicate (according to the textbook) whether each item would fall under the heading of impediment to imitation (IMI) or early mover advantage (EMA).

Superior access to customers is listed under (EMA, IMI).

Network effects is listed under (EMA, IMI).

Economies of scale is listed under (EMA, IMI).

Legal restrictions is listed under (EMA, IMI).

Buyer switching costs is listed under (EMA, IMI).