Roosevelt also did it too and did it first ahead of Shimamura. Wang Anshi might have did it first in the world, but his achievements are not very well known except among historical economic scholars where there are studies and writings on this subject, which enabled the Song to become very rich. And between Wang Anshi and Roosevelt, there is John Keynes. Much more recently there is also Richard Werner from Germany. So this monetary theory is continuously being fine honed and adapted to central banking theories.Why it called Shimamuran, he did not invent it, he just observed it, China had done it for millenium,. China grew its economic by trial error, failure and success, never a man called Shimamuro been an economic adviser, so, why, when China is on right track , there is suddenly someone claiming he understand everything good about China's economic ?
This is the best theory to have for a country in a crisis, such as the US during WW2 and Japan just after the WW2. It allows for swift recovery and development (Japan, S. Korea, Taiwan, Singapore, and now China). Somehow lost to the West as the West reverts to neoclassicism economics.