Reuters – Japanese Prime Minister Shinzo Abe is set to tour Singapore’s two lavish casino resorts on Friday as his home country toys with the idea of liberalizing casino gambling to boost tourism and attract investment. Japan, home to 128 million people and the world’s third largest economy, is widely seen as a prize market for casino operators due to its affluent population and close proximity to wealthy Asian gamblers in the region. Brokerage CLSA estimates Japan could be the world’s third biggest gambling market after Macau and the United States, raking in revenues of at least $40 billion annually…