摘要：We analyze the impact of increased outside opportunities brought
to consumers by improved access to a global market on local market
performance under monopoly vs. oligopoly. If consumers choose
once where to buy, we show that under all forms of organizing the
local market, increased competition from the global market will locally
crowd out variety. The e..ect on prices is much less clear. While
increased global competition yields a price reduction under monopoly,
prices may increase under oligopoly. We check the robustness of these
results in various extensions and draw consequences on competition
and industrial policies.
