One of the most important factors in fundamental analysis are business cycles. Business cycles are usually related to changes in the leadership structure of the political system and the emergence of new technologies; because the new leaders do not depend on the staff of the previous person. The existing rents should be prevented and the users of those rents should be removed through economic mechanisms in a very respectful manner and they should be replaced by the cadre trusted by the new leader.

Sometimes, the emergence of new technologies can disrupt economic equations and eliminate a group of jobs and businesses and replace another group. This phenomenon causes the economic system to get used to a mechanism for 15 to 30 years. Suddenly, by changing the equations, the system that could not update itself is surprised and removed from the cycle.

For example, at the exact moment when the price of a stock has decreased and you are at a loss, at the exact moment another person is buying the same stock at the lowest price, in other words, a new rich group is being born!

The reason for people's losses in the market and the ineffectiveness of technical analysis; This is exactly the business cycles and not updating the knowledge and information of traders.

The difficulty here is that the analyst must examine various factors in the context of time and periods in order to be able to make a better analysis and decision. To solve this problem; "Pavarieh and Karbar" in their research about the profitability of the aircraft manufacturing industry from 1951 to 1971 included eleven variables in addition to time in their calculations, which are Spline models. This research specifically shows the business cycles in 1951-1954 (Korean War), 1954-1965 (Peace Era) and 1965-1971 (Vietnam War).

The use of Spline Functions models is widely used to analyze business cycles.

As it can be seen, bitcoin has clearly tried to correct its price wherever the market price deviates from its intrinsic value and return to its intrinsic value. Such a thing is also available for all other assets in the stock market and Forex market.