Vaporizer pens can be used to inhale a number of different materials. Often, people call vaporizer pens by names that indicate what they are used to vape. The three main types include: - The oil vaporizer pen, which is also called an oil pen or oil vape pen.
The United States is the world's largest economy with a GDP of approximately $18.56 trillion, notably due to high average incomes, a large population, capital investment, moderate unemployment, high consumer spending, a relatively young population, and technological innovation.
It is also worldâs second most populous continent. 1.111 billion people (2013) live in Africa. Algeria is the largest country (by area) in Africa; and Nigeria is the largest country by population. In early 2014 Nigeria surpassed South Africa as Africaâs largest economy. Here is a brief overview of the largest economies in Africa: Oil and gas contribute significantly to Equatorial Guineaâs economy. The economy of Equatorial Guinea was affected by recession in 2013. It was due to fall in revenue from oil and lower oil and gas output.