The basic idea of AC is that before going back the price should lower speed. And this indicator is designed to measure this speed (and to give notice about the expected trend change in case of slowdown). But, we see the same story with the fractal idea. Theoretical idea and its practical implementation have nothing in common. AC is just the difference between Awesome Oscillator and its 5-period averaging: MEDIAN PRICE = (HIGH + LOW) / 2 AO = SMA (MEDIAN PRICE, 5) − SMA (MEDIAN PRICE, 34) AC = AO − SMA (AO, 5) Where: MEDIAN PRICE — midpoint price; HIGH — the highest bar price; LOW — the lowest bar price; SMA — simple moving average; AO — Awesome Oscillator. As usual, figure selection is not explained and, might be, random or slanted in favour of history (the last mentioned is not proved because this indicator loses on the history also). Black lines — buying moments. Red lines — selling. As you can see, there is nothing in common with features declared.