Sentence:  These provisions are designed to reflect the differences in wealth and population among the States , with the objective that a vocationally handicapped person have access to needed services regardless of whether he resides in a State with a low or high per capita <WSD>income</WSD> or a sparsely or thickly populated State . 
Meaning of the word marked with <WSD> tags:  the financial gain (earned or unearned) accruing over a given period of time