Currency purchasing-power value
IntermarketAdvanced
Purchasing-power-parity value treats a currency as cheap or rich versus the exchange rate that would equalize prices of a basket of goods. A systematic version buys the cheap currencies and shorts the rich ones, then waits. It is a slow value rule in FX. It is not the interest-rate carry trade, which ranks currencies by yield rather than by price level.
Not investment advice. Nothing here is a recommendation to buy or sell anything. Backtests and historical studies are not guarantees, and a rule that worked in one sample can fail in the next. Trading can lose money. Links are for education, not endorsements. Do your own research.
- Rules
- Use a published real exchange rate or PPP estimate that is available at month-end. Rank G10 or another liquid set. Go long the cheapest few and short the richest few in equal FX exposure, hedged so the bet is the currency rather than a foreign equity market. Rebalance monthly or quarterly. Do not override the rank because of a political headline.
- Where AI fits
- AI can store the vintage of the PPP data so later revisions do not enter the past signal, and it can keep this book separate from a yield-ranked carry book. Overlap should be reported, not assumed to be zero. The model should not invent a fair value from a single price index.
- Markets
- Liquid deliverable FX forwards or futures. Exotic pegs are a different risk.
- Timeframes
- Monthly or quarterly. PPP is slow.
- Risks
- Misvaluations can last for years, and intervention can make them last longer. Inflation statistics are revised. Funding a short rich currency that is also a high yielder stacks carry losses on value losses. Crisis rebounds in the dollar overwhelm the rank.