Logrolling
What is Logrolling?
Logrolling is vote trading in which legislators swap support across bills so each can pass a measure they care intensely about.
Because simple majority voting ignores the intensity of preferences, legislators trade votes: 'I'll back your project if you back mine.' Explicit logrolling is direct vote-swapping, while implicit logrolling bundles many provisions into one bill (an omnibus). It can improve outcomes by letting intensity be expressed, but it often funds special-interest projects whose total cost exceeds their benefit, a classic public-choice inefficiency.
Logrolling: a worked example
Three districts split every project's cost equally. Project A delivers $90 of benefit to district 1 and costs $120, so each district pays $40. Standing alone it loses two votes to one, since districts 2 and 3 are out $40 apiece for nothing. Project B does the same for district 2. Districts 1 and 2 now swap votes and both bills pass. District 1 collects $90 and pays $40 twice, netting $10, and district 2 nets the same, while district 3 pays $80 and receives nothing. The pair spends $240 to deliver $180, destroying $60 of value, and it commands a majority both times.
The mistake students make with logrolling
Logrolling gets labeled either as plain corruption or as automatically efficient because it finally lets intensity count. Both verdicts skip the arithmetic. A vote trade raises welfare when the intense minority gains more than the mildly opposed majority loses, and destroys welfare when the traded projects cost more than they deliver and the bill is spread across districts that get nothing, as the example shows. The sign depends on who pays, not on whether a trade took place.
Logrolling questions
Is logrolling legal?
Logrolling between legislators is a normal and generally lawful part of lawmaking rather than a crime. Trading a vote for a vote is how a large body with limited floor time moves anything at all. What is barred is trading a vote for personal payment or a job, which is bribery, and the dividing line is whether the legislator gains privately or the district does.
What is the difference between explicit and implicit logrolling?
Explicit logrolling is a direct swap across two separate votes: I support your bill, you support mine. Implicit logrolling folds the same trade into a single bill, so an omnibus arrives carrying a harbor project, a research center and a road, and members vote for the whole package to secure their own piece. Implicit logrolling is harder to trace, because no trade shows up in the voting record.
Is logrolling good or bad for the economy?
Logrolling can run either way, and the deciding factor is who bears the cost. It improves outcomes when it lets a minority with a large stake outweigh a majority that barely cares, something plain majority voting cannot do. It wastes resources when each traded project delivers less value than it consumes and the cost is spread over everyone, including districts that receive nothing from either bill.
Related terms
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