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Because mind / body therapies can treat or prevent these illnesses , the integration of tools such as Tai Chi into our health institutions could save the United States $ 700 billion per year , and save trillions per year worldwide . Remember , that our brains , although containing some trillion neurons , has a fixed architecture , as specified by our genes . Medicare would still cost $ 2.14 trillion in that span . Due to their buoyant performance over the review period , DIY current value sales registered a CAGR of nearly 20 % between 1999 and 2004 to reach Col $ 4.6 trillion in the latter year . After all , there are some trillion trillion other stars to choose from . What 's more , the report predicted that e-commerce will continue its rapid growth , generating $ 7.29 trillion in sales transactions worldwide by 2004 .