Sentence:  In the first place , a large part of the discrepancy between President Eisenhower 's estimate of a 1.5 billion dollar surplus for the same period and the new estimate of an almost seven billion dollar deficit <WSD>is</WSD> the result of the outgoing President 's farewell gift of a political booby-trap to his successor . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)