Final answer:
Majority leaders influence public policy by controlling which bills go to committees and shaping the legislative agenda to favor their party's policies.
Step-by-step explanation:
Majority leaders from a political party influence public policy by leveraging their control over the legislative agenda. They do not have the power to veto bills, pass laws on their own, or enforce laws; those powers belong to other branches or roles within the government. Instead, majority leaders have significant influence over which bill ideas go to committees, shaping the legislative process and helping to enact their party's policy priorities.
In many political systems, the majority party controls the schedule for what bills get debated and holds more seats on legislative committees. With these powers, the majority party is more likely to get preferred policies enacted into law. Moreover, the leadership can use special rules to guide bills through the legislative process, restrict debate, and focus member attention towards predetermined outcomes, thus significantly influencing public policy.