Fill in the following text with words from the list. Do not forget to conjugate or modify them when necessary.

competition / competitiveness / to fire / flexibility / to hire / job mobility / job security / labour costs / a layoff / on the black market / perks / redundant / to resign / to sack / a salary rise / a trade union / unemployment / unpaid / upward mobility

Nowadays, has become a necessity in most companies.
The is so fierce that managers try and reduce their costs as much as possible.
This strategy has direct consequences on employees: indeed you may be one day and the following day if your employers are not satisfied with you.
Labour costs lead managers to reduce their staff. Although trade unions still fight for and , unemployment has led workers to minimize their demands and to accept as well as overtime.