Price action is based on humans behaving rationally, logically, and similarly in similar situations over time, and is the cumulative effect of institutional trading. It has been, and always will remain fundamentally unchanged. If you compare a chart from 100 years ago (such as the crash of 1929) with one of today with the time scales removed, you will not be able to tell the difference between the two. It does not matter if you compare a yearly, monthly, daily, or even 1 minute chart with any other chart of a different time frame. Price action appears the same and works the same in every market, and on every time frame. The institutions cannot hide what they are doing; price action is their foot print.
Price action can be used to invest long term, or day trade any market. It allows a trader or investor to identify opportunities without the use of any indicators. In fact, all indicators are a derivative of price action in one form or another. Interestingly, the patterns which repeat as well as trend tendencies can be observed on different charts, even outside of markets.
Can you tell a difference between these two charts? The first is a of CSX . The second is a 5 minute chart of the MES (micro s&p ). All markets and charts look the same, and behave similarly. Once you understand the information within, you can understand what the institutions are doing at any given time.