01Where else it exists
- Local presence(Marginal → Widespread)
- Exported from Brazil(Marginal → Widespread)
- Brazil
- Absent (checked)
- No data
Sovereign projection: Equal Earth centered on 60° W, south up, as on IBGE's world maps. Colonial projection: Equal Earth. Places with uncertain presence take the color of the highest possible level; the table shows the full range.
Place (11)
| Place | Presence | Weight | Sources |
|---|---|---|---|
| Argentina | Widespread | 1 | [1] |
| Australia | Widespread | 1 | [1] |
| Belgium | Widespread | 1 | [1] |
| Bolivia | Widespread | 1 | [1] |
| Ecuador | Widespread | 1 | [1] |
| Luxembourg | Widespread | 1 | [1] |
| Peru | Widespread | 1 | [1] |
| Singapore | Widespread | 1 | [1] |
| Uruguay | Widespread | 1 | [1] |
| Paraguay | Marginal – Regional | 0.1–0.5 | [1] |
| Mexico | Absent (checked) – Marginal | 0–0.1 | [1] |
| Presence abroad | 9.1–9.6 | ||
02What exactly is being measured
Legal obligation to vote in general elections, with a penalty for those who neither vote nor justify their absence.
03Context
About ten countries have a similar rule [1].
04How we got this number
- Presence abroad
Sum of each place's weight: widespread = 1, regional = 0.5, marginal = 0.1. Where it only exists as a Brazilian export, the weight is multiplied by 0.5.
- 9.35 (9.1–9.6)
- Exclusivity E
From 0 (exists everywhere) to 1 (only in Brazil), on a log scale.
- 0.49 (0.49–0.5)
- Intensity I
How much more common it is in Brazil than in the other places where it exists.
Slightly stricter in Brazil than in the other countries with the rule. [1]
- 1 of 4
- Rarity coefficient R
R = E + 0.5 × (I ÷ 4) × (1 − E)
R = 0.49 + 0.5 × (1 ÷ 4) × (1 − 0.49) = 0.56
- 0.56
- Jabuticaba Index®
- 56% (55–56%)
Not part of the score
How aware Brazilians are that this is rare abroad.
Sometimes remembered as rare, which the data don't confirm. editorial judgment
2 of 4
Computed from source types: from A (official and academic data) to D (editorial judgment). It does not change the index.
A
05Sources
- [1]
A. Nonymous, P. Laceholder. A Global Survey of Allegedly Unique Things
University of Nowhere Press · Jun 2024 · Academic
example.org/fictional-survey · accessed Sep 25, 2026