[A]n economy cannot grow and thrive without a strong commercial and investment banking infrastructure. Without the ability to create debt and equity … - Henry Kaufman

In 1900, two-thirds of the nation's... citizens still lived in rural communities... But that was changing rapidly (by 1920 more than half of all Americans lived in cities), thanks in large part to the explosive growth of manufacturing. ...[T]wo-thirds of the nation's output was in manufactured goods, even though manufacturing employed less than a quarter of the work force. The average plant producing petroleum, iron and steel, and textiles (the three leading industries)... were belied by the behemoth factories... Carnegie... christened the new century by selling his sprawling steel interests to J. P. Morgan, who promptly assembled the $1.4 billion United States Steel Corporation in 1901, the nation's first billion-dollar industry.
Still, American manufacturing was then churning out a tiny fraction—roughly 1 percent...—of what today's cleaner and enormously more efficient plants produce.

In the 1890s and 1810s corporate consolidation inspired an enormous public outcry against the "trusts" (...big business). Newspapers overflowed with editorial deriding... "robber barons," and for the first time in American history the federal government stepped in to regulate... First came the ... designed to limit discriminatory railroad rates, and then the Sherman Anti-Trust Act of 1890—Congresses' first attempt to constrain monopolistic practices. In practice, both acts proved to be weak against the predominant power of big business. For decades, the courts in effect made regulatory policy in how they interpreted... these two...

[R]icher nations have larger stock and bond markets than poorer ones, and the assets of financial intermediaries are much larger in relation to GDP.