Positive earnings reports and reaffirmed guidance typically lead to increased investor confidence and can drive up a company's stock price in the short term. Fiserv's better-than-expected Q1 results and the reiteration of their FY24 guidance signal strong financial health and operational stability, which are key factors investors look for. This news is directly related to Fiserv and has a high relevance and importance to the company's financial outlook, justifying the positive score.