Pegged Currency
Moeda cujo valor é mantido fixo em relação a outra moeda, commodity ou cesta de referência, por meio de mecanismos que sustentam essa paridade.
Key points
- A pegged currency is one whose value is kept fixed relative to an external reference, such as another currency or a commodity.
- The peg does not sustain itself: it requires reserves, rules, or intervention to guarantee conversion at the promised value.
- In the crypto world, stablecoins are the most common example, generally pegged to the dollar through reserve backing.
What is a pegged currency?
A pegged currency is a currency whose value is fixed relative to another reference, rather than floating freely. The term comes both from the traditional world, where countries fix their currencies to the dollar, for example, and from the crypto world, where stablecoins seek to maintain a constant value against a fiat currency. The common idea is to offer stability relative to something known.
How it works
Maintaining a peg requires a mechanism that guarantees conversion at the promised value. In the traditional case, a monetary authority usually holds reserves and intervenes in the market, buying or selling its own currency to hold the exchange rate. In the case of collateralized stablecoins, an issuer holds reserves and allows issuance and redemption, and market arbitrage pushes the price back when it drifts away.
The strength of a peg depends on credibility and the capacity to sustain it. As long as the market trusts that conversion at the fixed value is possible, the peg holds. When that trust fails, the currency can lose its anchor, a move called a depeg, sometimes abruptly.
There are different degrees of rigidity: some pegs are strict, others allow small fluctuation around the reference.
Why it matters
Pegged currencies offer predictability, which is useful for payments and settlement. A dollar stablecoin allows operators to transact with stable value in an environment of volatile assets, and a currency pegged to the real plays a similar role in local operations. It is this stability that makes it possible to use crypto as a settlement medium.
Limitations
No peg is guaranteed: it depends on sufficient reserves, credibility, and liquidity to be defended. Under stress, even pegged currencies can break their anchor, and poorly designed pegs have already collapsed. For this reason, the soundness of a pegged currency lies less in the promised value and more in the quality of the mechanism that sustains it. Closely tracking reserves and liquidity is, therefore, more informative than the announced peg, before trusting value to it.