What are the consequences of unemployment.how has it detrimental impact on the overall growth?

This seems like a simple question, but the answer is not simple at all. Nations allow politicians to make policies that cause unemployment, but those politicians have no clue about the consequences.

You need to study this topic in depth. There are more answers than you think, and many of them are big surprises to everyone. Start by reading the free materials at mises.org and fee.org