The expansion plan by JPMorgan Chase to build 500 new branches directly impacts its potential to increase its market share in U.S. deposits, which is a critical factor for its revenue and growth prospects. This aggressive expansion strategy is likely to be viewed positively by investors, as it demonstrates the bank's commitment to growing its footprint and capturing a larger share of the market. The plan's focus on increasing the deposit base is crucial for the bank's lending capabilities and overall financial health, making this news highly relevant and important for investors in JPM.