JPMorgan Chase also plans to expand its small business lending and step up activities in the affordable housing space. NEW YORK CITY—As part of a $20-billion investment plan announced Tuesday, JPMorgan Chase plans to add as many as 4,000 jobs and 400 bank branches in new US markets. The financial services giant also plans to step up lending in the affordable housing arena, at both the single-family and multifamily levels. At present, Chase has 5,130 branches in 23 states and