How does Downs’ rational choice model explain a voter’s decision or calculation to turn out to vote?Discuss

Rational choice scholars such as Anthony Downs have developed rational choice models to help us understand voting behavior. How does Downs’ rational choice model explain a voter’s decision or calculation to turn out to vote? How did Riker and Ordeshook revise Downs’ original “Calculus of Voting”? Explain each element in the equation(s). (min. word count: 200 words)