Oregon Gov. Kate Brown proposed a minimum-wage increase Thursday that would set the Portland area’s minimum pay to above $15 an hour and the rest of the state’s to $13.50 by 2022.

If the proposal, which is opposed by business groups, is approved by state legislators, Oregon could become the first state to move forward with a tiered increase, in which minimum pay in major cities rises at different rates than suburban or rural areas, experts said.

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