Answer:
<em><u>Functional </u></em>
Explanation:
<em>Function</em><em>.</em><em> </em><em>a </em><em>relationship</em><em> </em><em>in </em><em>which </em><em>f</em><em>or </em><em>every </em><em>input</em><em> </em><em>there </em><em>exactly</em><em> </em><em>one </em><em>output</em><em>.</em>
As of 2011, the world's population has reached 7 billion. The annual population growth rate is 1.2%, thereby there would be an additional 1 billion population growth at approximately 11 years or by 2021 the population would be 8 billion.
<u>Answer: </u>Natural unemployment
<u>Explanation:</u>
Natural unemployment always exists even in a healthy economy this is because the people keep changing their jobs and they even leave the current job in search of the new ones. Natural unemployment also includes other types of unemployment such as seasonal, structural and frictional unemployment types.
Also some people might possess skills that are not necessary in the labor market. The natural unemployment is still in the economy even when there is technological advancement, industry expansion. New labor forces enter into market every year and people search jobs for better opportunities.