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这只是理论值,但是你没有考虑到:
如果真的能套公式,那么价格走势图应该是一条平滑的曲线,而不是这样:
我也问 GTP:Does forward exchange rate always follow the interest rate parity theory?
回答:
The Interest Rate Parity (IRP) theory suggests that the difference in interest rates between two countries should equal the difference between the forward exchange rate and the spot exchange rate of their currencies. However, in reality, the forward exchange rate doesn't always precisely follow the IRP theory due to various factors. Here are some reasons why:
Risk Premiums: Forward exchange rates might incorporate risk premiums due to factors such as uncertainty, political instability, or economic risks. Investors demand higher returns for holding assets in a currency with higher risk, which can cause deviations from IRP.
Transaction Costs: There are transaction costs associated with currency trading. These costs can influence the forward exchange rate, leading to deviations from IRP.
Capital Controls: Governments may impose capital controls that restrict the free flow of capital across borders. Such controls can affect interest rate differentials and cause deviations from IRP.
Liquidity Premium: If a currency pair has low liquidity, the forward exchange rate might not precisely follow the IRP theory due to liquidity premiums demanded by market participants.
Market Expectations: Forward exchange rates can be influenced by market expectations about future economic conditions, which might not perfectly align with interest rate differentials.
Speculation and Market Sentiment: Speculative activities and changes in market sentiment can cause fluctuations in forward exchange rates, leading to deviations from IRP.
Central Bank Interventions: Central banks sometimes intervene in the foreign exchange market to influence the value of their currency. Such interventions can lead to deviations from IRP.
While the IRP theory provides a useful framework for understanding the relationship between interest rates and exchange rates, these factors can cause deviations from the theory in practice. Thus, while the forward exchange rate often moves in the direction implied by IRP, it doesn't always follow it exactly. |
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