There was a 14th-century Franciscan friar by the name of William of Ockham who is credited with having formalized the principle that "simpler solutions are likely to be more correct than complex ones." Hence, we seem to always try to reduce everything to a single cause and effect. Some have rephrased this as "keep it simple, stupid," and it has emerged with the label "Ockham’s razor," which is supposed to be a tool that cuts through complexity to get from point A to point B. However, is this the very problem that prevents us from seeing reality? It was, after all, this very principle that supported the flat earth theory. It prevailed and even led to the execution of people such as Giordano Bruno (1548–1600) for daring to propose that the universe was not revolving around a flat Earth. Even Galileo Galilei (1564-1642) was charged in 1633 by the Roman Inquisition and forced to sign the confession or suffer the same fate of Bruno that the Earth was flat. In funds management, the statement that proves there is complexity is a legal requirement: Past performance is not a predictor of future success. All investing involves the risk of loss. While there is a desire to make complexity simple and understandable, this is really completely misguided. Clearly, simplicity rather than complexity is by no means the proper course of action for we then cannot see the interconnections of how everything truly functions. The greatest mistake in the analysis is always trying to reduce any effect down to a single cause. The world is a complex mechanism. It is indeed like a rainforest. There are countless species and each is interconnected. Exterminate one and you will find that it was the food source for another. That species, in turn, was the food source for yet another and so on. The world economy is equally complex. This is why I say we are ALL CONNECTED. 

Source: www.armstrongeconomics.com