The cause of unemployment in many countries is competition in the labor market. There are few employment opportunities. It leads to a situation where every available opportunity, there are more than one qualified individual. The effect is that it causes social and economic effects. The poverty index among the unemployed is high since some people do not have a source of income.
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The baby boom is also called Post-World War II baby boom, and this already reveals the cause: after the war the economy was raising again, after hard times, and people were optimistic about the future
The answer to that is Paralanguage where oral delivery of a verbal message is expressed via facial expression or intonation.
