Global inflationary forces are finally seeping into Japan's economy after decades of falling prices, forcing investors to radically rethink their Japan bets as the Bank of Japan considers a major policy shift.

International investors, who have long favored stocks benefiting from Japan's aging population or a weakening yen, are tearing up their playbooks to focus on expected higher interest rates, more generous dividends and a revival in consumer spending.

The policy switch has been slow in coming but could herald an entirely new way of investing in Japan if a predicted long-term inflation rate of 2% in 2024 really happens.