The colors of visible light, often referred to as ROY G BIV (for red, orange, yellow, green, blue, indigo, and violet), are a small portion of the entire electromagnetic spectrum. Light can be thought of as a stream of packets of energy called photons.
The United States has a mixed economy and has maintained a stable overall GDP growth rate, a moderate unemployment rate, and high levels of research and capital investment. Its seven largest trading partners are Canada, China, Mexico, Japan, Germany, South Korea, and the United Kingdom.
The U.S. Economic System. 1  Laissez-faire Capitalism & the US Economy 4:18. 2  6:13 Next Lesson. The Cyclical Phases of the US Economy. 3  Monopolies & Oligopolies in the US Economy 5:15. 4  How Saving & Investing Contribute to the US Economy 5:35. 5  The U.S. Economic System.