The Consumer-Worker Party of Japan, with allies in the Zaibatsus and the government bringing certain military factions to their side, overthrows rising Japanese military adventurism/nationalism (removing those people from government influence and the Emperor's circle) and ushers in what is hoped to be an age of trade and prosperity.
The Consumer-Workers, and those intellectuals in the government with similar views, believe that the people of Japan should be able to afford quality products from foreign lands by selling quality Japanese products abroad, ensuring the quality and low prices by always having the option of competing foreign and Japanese products. The idea being that high import and export rates on manufactured goods would provide healthy competition, national pride, and peaceful relations with other nations. Show that "we're good enough to have the best things of the West and good enough that the West wants the best of what we have". This opinion attracted the support of the economic elites after some thinking, creating a powerful bloc capable of swaying certain military men to their side.
What POD(s) are needed for this to happen and when could this theoretically happen?