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.
1. United States. The US economy is the largest economy in the world in terms of nominal GDP (measured at current prices in US dollars). The $17.41 trillion US economy is approximately 22.44 percent of the gross world product.rance. France, the most visited country in the world is the fifth largest economy in the world with a nominal GDP of $2.9 trillion. Its GDP in terms of PPP is around $2.59 trillion.