For much of its long history, Goldman Sachs served corporations and wealthy clients, not average individuals. In search of more predictable sources of revenue, the bank is now looking to Main Street and beyond. Under the leadership of CEO David Solomon, Goldman Sachs has expanded its push into consumer banking, grown its wealth management business, and launched a treasury services business for corporations, all with the aim of offsetting volatile revenues from trading. Its consumer push is making a big splash: Last year, the bank announced that it was issuing tech giant Apple’s digital-first credit card.