CHICAGO (AP) — Chicago's minimum-wage workers will earn $13 an hour by 2019 under a plan the City Council approved overwhelmingly on Tuesday. Pushed by Mayor Rahm Emanuel, the change makes the nation's third-largest city the latest to raise its rate. Still, opponents worry about the impact on business.

Here are some things to know about Chicago's minimum wage hike.

THE PLAN

The Chicago plan raises Illinois' $8.25 rate — which is $1 higher than the federal rate — incrementally. It'll get bumped to $10 next year, later increasing by steps of 50 cents and $1. City officials estimate more than 400,000 Chicago workers will benefit.

THE TIMING

The politically popular idea comes as Emanuel faces re-election and two high-profile challengers, Alderman Bob Fioretti and Cook County Commissioner Jesus Garcia, are pushing for an even higher rate of $15. Emanuel, who says the higher wage addresses cost-of-living increases, hopes Chicago's plan will "jolt" state lawmakers to act. He also cites voters' wide support of a nonbinding November ballot measure which called for a $10 rate by January.

State legislators were considering a plan that could raise Illinois' rate over time to $11, but that effort stalled late Tuesday. Emanuel initially fast-tracked the plan over fears that legislators would pre-empt Chicago's increase.

THE ARGUMENTS

Five of Chicago's 50 aldermen voted against the proposal. Two are small business owners, including Alderman Tom Tunney who runs Ann Sather restaurants. He fears companies might leave Chicago over the increased costs of doing business. Groups like the Chicagoland Chamber of Commerce, which oppose a hike, say a higher wage means disadvantages for city businesses.

Outgoing Democratic Gov. Pat Quinn had pushed for a state-level increase, but Republican Gov.-elect Bruce Rauner says he'll support a hike only if it's done in conjunction with other reforms. He urged Emanuel to keep Chicago's competitiveness in mind. However, Emanuel disputed the notion of disadvantages, saying working families shouldn't live in poverty.

Emanuel also addressed business group concerns of the legality of the move by saying Chicago has the authority to raise its own rate.

WHERE CHICAGO STANDS

Chicago is the latest major city to give minimum wage employees a raise. This year, Seattle officials approved a phased-in $15 wage. In California, San Francisco voters approved a $15 in November, while Oakland OK'd an increase to $12.25. Portland, Maine, and Louisville are considering increases.