Good question. Think in the Civil Service employment salary schemes, there is the daily rated, timescale and superscale pay ranges.

The daily rated are for those who are paid daily obviously. Usually low skilled jobs.
Most civil servants would be in the timescale category. The timescale salary range is quite wide, and has many bands / bars in the range. A typical servant would start in a certain band and will get a fixed yearly increment till he/she crosses the next bar through promotion. If he/she cannot get promoted, that he/she will hit the maximum limit within that band after a few years and stay put.

For those with high potential for greater responsibilities, they will be promoted out of the timescale scheme onto the superscale scheme where the increment and bonuses are not so fixed and very dependent of meeting performance targets (KPI). I think the superscale starting salary is around $12K per month.

I could be outdated.