Work by Dr. Gershon and others has shown that serotonin is necessary for the repair of cells in the liver and lungs, and plays a role in normal heart development and bone-mass accumulation.

WSJ: A Gut Check for Many Ailments

It is likely that lower taxes would also stimulate increases in research and development and other inventive activities, increase entrepreneurship, increase the accumulation of human capital, lead to more immigration of high-skilled workers, and encourage foreign firms to locate in the United States.

WSJ: Thomas F. Cooley and Lee E. Ohanian: The Bush Tax Cuts Never Went Far Enough

Economic expansion and development is the happy consequence of people participating in an extensive market division labor made possible by the accumulation of capital that is wisely invested and directed by entrepreneurs.

FORBES: 2 Percent Economic Growth: Real or Apparent?