$4.$ How do the following events affect:

$($i$)$ the labor force participation rate and

$($ii$)$ the unemployment rate

a$.$ A major automobile company goes broke and lays off its workers. The workers immediately start looking for new jobs $(1$ point each answer$)$

i$.$

ii$.$

b$.$ After an unsuccessful search, some of the laid$-$off workers quit looking for new work $(1$ point each answer$)$