Election manifestos serve as brief summaries of large amounts of information about what kinds of policies a candidate is likely to put forward, as well as analytical predictions about what the likely effects of those policies will be (or of the opposite policies).
Explanation:
It is through a printed Election Manifesto that a candidate contesting the election can inform the citizens about what policies would he/she be working on after getting elected to the post that he/she is contesting the election for.
The candidate can also include in this manifesto the possible outcomes of the policies that he/she has decided to implement.