Which of the following is *not* true regarding the competitive dynamics of most sharing economy marketplaces?
a. ratings represent a switching cost built over time by early participants in sharing economy marketplaces.
b. late-movers have a substantial advantage in this market since inventory should be cheaper to acquire for those firms that have entered markets more recently.
c. network effects should grow over time, favoring firms that got a successful, early start over rivals who arrived late doing the same thing.
d. these are two-sided markets.
e. none of the above - all statements are true.