A more thorough explanation:

Definition: Union rate refers to the minimum wage set by a union, usually expressed as an hourly rate or piecework rate.

Examples:

• A union sets a minimum hourly rate of $15 for all its members.
• A union negotiates a piecework rate of $2 per item produced for its members.

These examples illustrate how a union sets a minimum wage for its members, which is known as the union rate. The union rate ensures that workers are paid a fair wage for their work and helps to prevent exploitation by employers.