TOKYO -- In May this year, Japan's Seven & i Holdings celebrated 50 years of flagship 7-Eleven stores in its domestic market, with thoughts turning to how it might develop the world's biggest convenience retail chain over the next five decades.

Marriage of convenience? Canada's Alimentation Couche-Tard has made an ambitious, preliminary takeover approach for the Japanese company that owns 7-Eleven. (Photos by Reuters and Yuji Murakami)
Couche-Tard targets food business, U.S. market; regulatory, antitrust issues weigh
TOKYO -- In May this year, Japan's Seven & i Holdings celebrated 50 years of flagship 7-Eleven stores in its domestic market, with thoughts turning to how it might develop the world's biggest convenience retail chain over the next five decades.