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A
quanto (or
cross-currency derivative)
is a cash settled
derivative (such as a
future or option) that has an
underlier
denominated in one ("foreign") currency, but settles in another ("domestic")
currency at a fixed exchange rate. For example, the Chicago Mercantile Exchange
(CME) trades futures on Japan's Nikkei 225 stock index that settles for
USD 5.00
for each JPY .01 of value in the Nikkei index. If you hold a future, and the
Nikkei rises JPY 12 (or 12 points), you earn USD 6000.
Quantos are attractive because
they shield the purchaser from exchange rate fluctuations. If a US investor were
to invest directly in the Japanese stocks that comprise the Nikkei, he would be
exposed to both fluctuations in the Nikkei index and fluctuations in the USD/JPY exchange rate. Essentially, a quanto has an embedded currency
forward
with a variable notional amount. It is that
variable notional amount that give quantos their name—"quanto" is short for
"quantity adjusting option."
Quanto options have both the strike price and
underlier
denominated in the foreign currency. At exercise, the value of the option is
calculated as the option's
intrinsic value in the foreign currency, which is
then converted to the domestic currency at the fixed exchange rate.
A quanto swap (differential
swap or diff swap) is a
fixed-floating or floating-floating
interest rate swap. One of the
floating rates is a foreign interest rate, but it is applied to a notional
amount in the domestic currency. For example, a US investor might make USD
payments at 3-month USD Libor and receive USD payments at 3-month GBP
Libor – 85, with both payments calculated by applying the respective
interest rates to a USD 100MM notional amount. Floating-floating diff
swaps are a vehicle for directly betting on
spreads between different
currency's interest rates.
Pricing a quanto option entails modeling both the underlier and the exchange rate, as
well as the correlation between them. See Reiner (1992)
and Dravid, Richardson and Sun (1993).
Diff swaps are generally valued by devising an (imperfect) static
hedge, pricing
the components of that hedge, and adding a suitable spread for warehoused
risk. See Walmsley (2000).

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