Feel like sharing? Japan might not be your place.

Once home to the world's biggest technology drivers in the 1980s, Japan has missed the boat when it comes to expanding its sharing-economy sector. Miles behind the U.S. and dwarfed by China by more than 2,000 to 1, Japan's sharing economy is also smaller than those of other developed economies, including the U.K. and France.

The companies it does have in this fast-growing area are like Davids to the Goliaths of San Francisco-based Uber Technologies Inc. and Didi Chuxing, the Chinese ride-sharing company with users in more than 400 cities across the country.