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Would every FX currency pair or public stock that is under the 30 level using Relative Strength Index (RSI) be an undervalued pair?
No, and using a 37 year old formula in finance that is as simple as: should make it obvious technical analysis is more of a game for retail traders than investment advice. When it comes to currencies, there are a myriad of macroeconomic occurrences that do not follow a predictable timescale. Using indicators like RSI on any time frame will not magically illuminate broad human psychology and give you an edge. It is theoretically possible for a single public stock's price to be driven by a range of technical traders who all buy at RSI 30 and sell at RSI 70, after becoming a favorite stock on social media, but it is infinitely more likely for all market participants to have completely different goals.