would you like to give answer according to economic rules.

There is a seemingly direct,high correlation between them. A positive correlation between health and productivity,and then between productivity and income level,so obviously an indirect correlation between health and income level.

Go to http://www.nationmaster.com/ It has a database for many countries, and lets you graph relationships between many factors, such has income, education, labor, and health. It's fun to compare countries and see correlations.

Let me recall if a men has good health she/he can work accordingly can think fast can do his/her task in a given period of time, sometimes earlier than expected if that will be the outcome his/her labour productivity is high. If this notice by the management it may result to promotion which means increase of income if this continue position will be next things that will happen which mean income will higher than before. cowboy...

There is a direct relationship between health, productivity and income level. There is a famous saying that "health is wealth", which in my opinion means that if you are healthy, you can be more productive, and if you are more productive, you will make more money. You can't expect a poor sick man to be extra productive and thus make a good income. So take good care of your health Saifu. =) I hope this helps!