A nation's population can be either static, growing, or shrinking. Most of the earth's nations have growing populations. A territory with a static or shrinking population may experience short-term growth, but cannot experience long-term growth. It will suffer an inevitable decline.
But not every nation with a growing population will experience a growing economy. A population can grow slowly, moderately, or rapidly. The most favorable economic conditions are found in a moderately growing population.
A rapidly-growing population may outrun the economy's ability to provide basic services. A slowly growing population will not have enough workers to support its children and retirees: this is the source of the America's current problems - not enough workers. A moderately growing population also provides new jobs at precise rate for young adults entering the workforce, unemployment is thereby reduced.
So go get married and have babies!
