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How to invest in a currency increasing in value relative to another?
What you're looking for are either FX Forwards or FX Futures.   These products are traded differently but they are basically the same thing -- agreements to deliver currency at a defined exchange rate at a future time.   Almost every large venue or bank will transact forwards, when the counterparty (you or your broker) has sufficient trust and credit for the settlement risk, but the typical duration is less than a year though some will do a single-digit multi-year forward on a custom basis.  Then again, all forwards are considered custom contracts.  You'll also need to know that forwards are done on currency pairs, so you'll need to pick the currency to pair your NOK against.  Most likely you'll want EUR/NOK simply for the larger liquidity of that pair over other possible pairs. A quote on a forward will usually just be known by the standard currency pair ticker with a settlement date different from spot.  E.g. "EUR/NOK 12M" for the 12 month settlement. Futures, on the other hand, are exchange traded and more standardized.  The vast majority through the CME (Chicago Mercantile Exchange).  Your broker will need access to one of these exchanges and you simply need to "qualify" for futures trading (process depends on your broker).  Futures generally have highest liquidity for the next "IMM" expiration (quarterly expiration on well known standard dates), but I believe they're defined for more years out than forwards.   At one FX desk I've knowledge of, they had 6 years worth of quarterly expirations in their system at any one time.  Futures are generally known by a ticker composed of a "globex" or "cme" code for the currency concatenated with another code representing the expiration.  For example, "NOKH6" is 'NOK' for Norwegian Krone, 'H' for March, and '6' for the nearest future date's year that ends in '6' (i.e. 2016).   Note that you'll be legally liable to deliver the contracted size of Krone if you hold through expiration!  So the common trade is to hold the future, and net out just before expiration when the price more accurately reflects the current spot market.