The essence of index exchange traded funds (ETF) by examples. How ETFs work and where you can buy their shares. Advantages and disadvantages. TFGI, a leading independent research and consulting firm, reported that investment in ETFs increased to $ 6.10 trillion. According to Bank of America forecasts, this figure will steadily grow over the next 10 years and will grow 50 times. Capital inflows into ETFs are starting to spill over from mutual funds and for a reason. You can often hear from experienced investors about the need to diversify their assets. Of course, you can buy shares of different companies, maintain their ratios, carry out regular rebalancing in order to maintain the structure of the investment portfolio, but this requires a lot of time and serious investments. Here exchange-traded funds come to the aid of the investor.