We will see the economic health of Seattle reflected in this move.
One concern is that as cities raise their minimum wage, more people will move there. We saw this (for a different reason) with the Reagan recession and it put those cities under more stress.
Economic "health?" Poor health perhaps. What we will see:
1) Sharp rise in prices (fast food, restaurants, hotel rates, car washes, etc.). These extra costs will be a burden on them making the new minimum wage which, in essence, will place them back in the same bind they're already in.
2) Reduction in hours to avoid paying for medical insurance. The extra money the entry level workers make will go towards paying for Obamacare.
3) Layoffs. Reduction in the work force will place a greater workload on them who remain in the work force.