When it is difficult to hire employees, firms take longer to hire, which increases frictional unemployment.
So the correct filling is longer and frictional
What is Frictional Unemployment?
Transitions in employment that are voluntary within an economy lead to frictional unemployment. Even in an expanding, stable economy, frictional unemployment is a given. Frictional unemployment refers to workers who decide to leave their current jobs in search of new ones and people who are just starting out in the workforce. It excludes employees who hold onto their existing position until they find a new one because, presumably, they are never unemployed.
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