Increase Hourly Rate to Get Rich

I came across this post on increasing your hourly rate to get rich.

It is a good article because it illustrates 2 key facts:

1. How investing time in activities that don't pay immediately - such as learning how to invest or spending time after work to get a professional certificate - can end up paying handsomely in the future.  Then, by dividing the extra money by the hours of study, you have a high hourly rate.

2. How some activities, such as writing a book, can bring in a residual income years later, thus increasing the activity's hourly rate.