[1] Some master contracts may also permit local or regional variations in order to meet special economic, competitive, or other circumstances for a union or company.
[2] Other areas where master agreements can be found include tire manufacturing,[6] public education,[7] baking,[8] custodial and housekeeping services,[9] and healthcare.
[5][13] Master contracts can also be used strategically for other ends such as organizing and to break down employer resistance to collective bargaining.
[14] In the United States, some unions have sought to create master agreements which provide for a neutrality agreement, code of conduct for the organizing election, or neutral third-party oversight of an election in order to make union organizing easier.
[15] In the United States, unions have engaged in bitter battles over such master agreements in California and Ohio.