tontins

Tontins, or tontines, are financial arrangements in which a group of participants contributes to a common pool from which payments are allocated over time. In the traditional actuarial sense, a tontine is a life-contingent scheme: contributors receive periodic payments while alive, and as members die, the surviving participants share an increasing portion of the pool. The typical design ends with the last surviving participant receiving the remainder of the fund. A separate use of the term, common in West and Central Africa and in parts of the Caribbean, refers to rotating savings and credit associations (ROSCAs) in which members contribute fixed sums and one member takes the entire pot at each round; this tontine or tontin form emphasizes saving and liquidity rather than life contingencies.

History and origin: The tontine originated in the 17th century in Europe and is named for the Italian financier Lorenzo de Tonti, who proposed the structure as a means to pool longevity risk. The concept spread widely in the 18th and 19th centuries, but many jurisdictions later restricted or banned pure tontines because of concerns about incentives to hasten death and other abuses.

Modern status: Pure life-contingent tontines are now rare in regulated financial markets, though the idea has informed discussions about retirement income and longevity risk pooling, including proposals for regulated tontine life annuities with safeguards. By contrast, ROSCA-based tontines remain common informal savings groups in various regions, serving as community finance networks without formal guarantees.