A voter typically chooses a candidate (or party) for the legislature, rather than directly voting for specific policies.
When doing so, the voter is essentially selecting among bundles of policies that a candidate or a party will enact if in power.
Occurring principally in republics, the electorate, rather than directly voting on each individual piece of proposed legislation, must choose a number of candidates (or parties) for the legislature.
In so doing, they accept or reject each individual candidate or party and their "bundle" of positions on various issues.
[2] But it has also been argued that the bundling of policy packages necessitated by indivisibility weakens the signals provided even by well-informed voters.