 For years Nomura Holdings Inc 8604.T has relied on an army of retail salespeople to peddle stocks and bonds to investors sitting on one of the worlds largest pool of household savings, generating revenue even in the bleakest of markets. The crisis has only deepened concerns about the viability of Nomuras business model, which is more reliant on retail broking than rivals. For the last several years, Yorio Sawamoto, a 69-year-old small business owner in Osaka, has been trading with Nomura. 