Sentence:  In order to assist the States in maintaining basic vocational rehabilitation services , Section 2 of the amended Act provides that allotments to States for support of such services be based on ( 1 ) need , as measured by a State 's population , and ( 2 ) fiscal capacity , as measured by its per capita <WSD>income</WSD> . 
Meaning of the word marked with <WSD> tags:  the financial gain (earned or unearned) accruing over a given period of time